What are the motives of spell teaching spirits?

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In my world, there are spirits who can "trade" with humans. The trade is done when a spirit swears to gods to be a human's servant for using a specific spell (for example, in case of fireball, the spirit must create the exact same fireball the human demands and send it to the exact destination using its abilities), and in exchange the human accepts to make a specific sacrifice once and for all (for example, this could be "losing the ability to sleep").



Trade isn't done until both of them are fine with the trade.



Spirits can only trade with one person at a time, but they can trade more than once in their lifetime. Until the human dies, they can't trade with anyone else.



Spirits:



  • can't be seen by humans, except in dreams

  • don't have bodies

  • don't need to eat or consume anything

  • are immortal

  • can speak any language, and can enter any dream

  • know only 1 specific spell

My question is, why would a spirit trade with a human?










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    In my world, there are spirits who can "trade" with humans. The trade is done when a spirit swears to gods to be a human's servant for using a specific spell (for example, in case of fireball, the spirit must create the exact same fireball the human demands and send it to the exact destination using its abilities), and in exchange the human accepts to make a specific sacrifice once and for all (for example, this could be "losing the ability to sleep").



    Trade isn't done until both of them are fine with the trade.



    Spirits can only trade with one person at a time, but they can trade more than once in their lifetime. Until the human dies, they can't trade with anyone else.



    Spirits:



    • can't be seen by humans, except in dreams

    • don't have bodies

    • don't need to eat or consume anything

    • are immortal

    • can speak any language, and can enter any dream

    • know only 1 specific spell

    My question is, why would a spirit trade with a human?










    share|improve this question









    New contributor




    Sensei is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





















      up vote
      3
      down vote

      favorite









      up vote
      3
      down vote

      favorite











      In my world, there are spirits who can "trade" with humans. The trade is done when a spirit swears to gods to be a human's servant for using a specific spell (for example, in case of fireball, the spirit must create the exact same fireball the human demands and send it to the exact destination using its abilities), and in exchange the human accepts to make a specific sacrifice once and for all (for example, this could be "losing the ability to sleep").



      Trade isn't done until both of them are fine with the trade.



      Spirits can only trade with one person at a time, but they can trade more than once in their lifetime. Until the human dies, they can't trade with anyone else.



      Spirits:



      • can't be seen by humans, except in dreams

      • don't have bodies

      • don't need to eat or consume anything

      • are immortal

      • can speak any language, and can enter any dream

      • know only 1 specific spell

      My question is, why would a spirit trade with a human?










      share|improve this question









      New contributor




      Sensei is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      In my world, there are spirits who can "trade" with humans. The trade is done when a spirit swears to gods to be a human's servant for using a specific spell (for example, in case of fireball, the spirit must create the exact same fireball the human demands and send it to the exact destination using its abilities), and in exchange the human accepts to make a specific sacrifice once and for all (for example, this could be "losing the ability to sleep").



      Trade isn't done until both of them are fine with the trade.



      Spirits can only trade with one person at a time, but they can trade more than once in their lifetime. Until the human dies, they can't trade with anyone else.



      Spirits:



      • can't be seen by humans, except in dreams

      • don't have bodies

      • don't need to eat or consume anything

      • are immortal

      • can speak any language, and can enter any dream

      • know only 1 specific spell

      My question is, why would a spirit trade with a human?







      magic psychology fantasy-races






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      Sensei is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      edited 2 hours ago





















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          4 Answers
          4






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          oldest

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          up vote
          3
          down vote



          accepted










          Free Trade is mutually beneficial by definition: each party values what it receives more than what it gives up.



          Spirit could get more actual spirit power from what the human gives up, or entertainment, or bragging rights.



          Spirits do not consume anything, but they need a source of power. Humans trade gives them that power. Even if they do not need power to survive, it can enable them to do more things, travel further, etc.



          Spirits need entertainment b/c their immortal lives leave them bored of most things, but they enjoy observing the randomness of human emotions and their reactions to powers and curses from spirit trade.



          Finally, even if humans themselves are not entertaining, there is competition between spirits on who can get a more powerful human to trade with them, or to give up the most. Kinda like fishing by humans, where you mainly brag about size of the fish.



          Note that while the trade is "forever", I assume it only lasts until the human dies. Which is a very short period of time for immortal spirits.



          Edit: if you say that spirit can only trade once per its own infinite lifetime, then either all spirits have traded already, or none are interested in trading.






          share|improve this answer






















          • I edited my question.
            – Sensei
            2 hours ago

















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          1
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          They might take whatever the human gives up and use it to elevate themselves above a spirit






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          New contributor




          Aidan Kapur is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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          • Why would the human give something so big that it elevates the spirit? The human doesn't have to trade with the spirit.
            – Sensei
            3 hours ago











          • @Sensei trade is not a zero-sum game :)
            – Bald Bear
            2 hours ago

















          up vote
          1
          down vote













          Collectors.



          car collection
          https://www.independent.co.uk/life-style/motoring/a-look-inside-the-car-collection-of-michael-fux-a7950721.html



          Why does this dude have so many cars? He can only drive one at a time. He has them because he can, and he likes them, and they are bragworthy beautiful things, and then when he visits his rich friends he has something to talk about. Maybe he trades cars with them because he likes specific types of cars for his collections.



          So too the spirits. They cannot really use the things the humans give them but they collect that kind of stuff. When the spirits get together they pore over their collections, trade, comment, brag and so on.



          One other thing a spirit could do is trade something a human gives up with another human. Fireball spirit might find someone who really wanted a sound nights sleep, and exchange for sleeping (which Fireball spirit has in its collection) will give up the ability to whistle through her nose. Fireball spirit is a whistling aficionado and so makes the swap and improves its collection of various whistling powers.






          share|improve this answer




















          • Once a trade is done, the spirit can't trade with anyone else forever.
            – Sensei
            2 hours ago










          • @Sensei. trade is a contract with a human. Shouldn't spirit be released from that contract once the human dies? That's how it works with contracts between humans ...
            – Bald Bear
            2 hours ago










          • @Sensei - one and done? That fireball spirit is tied to that one human waiting for the chance to make its fireball spell? It seems like one fireball spirit could have a lot of human customers. What is the chance they all want fireballs at once? A person probably goes days at a time with no call to make a fireball. .
            – Willk
            2 hours ago










          • @BaldBear makes sense, edited the question.
            – Sensei
            2 hours ago











          • @Willk trading is a divine action, and gods may not accept his swear if the spirit is already a servant for another human.
            – Sensei
            2 hours ago

















          up vote
          1
          down vote













          The sacrifice actually carves off a portion of the person't soul or animating spirit. The spirit either consumes these pieces to sustain or enrich itself or it trades them to something that does use them.



          Maybe some high level being is creating an art installation: The concept of taste. It wants the ability to taste different things from several different beings (and the same thing since different people may taste salt differently) so it can perfect it's masterpiece.



          There could be a demon who hates humanity and is willing to pay for anything that diminishes humanity.



          The main thing is that the spirit itself may or may not be able to use those sacrifices but if the portion of the person the sacrifice represents can be traded, it doesn't matter.



          Also, if the other being are so different that they can't interact with the story universe, the spirits are going to be the only contact that the people have. Therefore the people will only know what the spirits tell them or what they can speculate (if the spirits don't talk about it).



          EDIT: [addition]



          If the spirit can truly only trade once (instead of once for each spell), maybe it is the trade that lets it evolve into the next higher form of spirit. Maybe the spirits are the grubs of the spirit world.






          share|improve this answer






















          • Nice answer. For the speculation part - there are legends and stories about people trading with spirits, so people already know about the spirits.
            – Sensei
            2 hours ago










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          4 Answers
          4






          active

          oldest

          votes








          4 Answers
          4






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes








          up vote
          3
          down vote



          accepted










          Free Trade is mutually beneficial by definition: each party values what it receives more than what it gives up.



          Spirit could get more actual spirit power from what the human gives up, or entertainment, or bragging rights.



          Spirits do not consume anything, but they need a source of power. Humans trade gives them that power. Even if they do not need power to survive, it can enable them to do more things, travel further, etc.



          Spirits need entertainment b/c their immortal lives leave them bored of most things, but they enjoy observing the randomness of human emotions and their reactions to powers and curses from spirit trade.



          Finally, even if humans themselves are not entertaining, there is competition between spirits on who can get a more powerful human to trade with them, or to give up the most. Kinda like fishing by humans, where you mainly brag about size of the fish.



          Note that while the trade is "forever", I assume it only lasts until the human dies. Which is a very short period of time for immortal spirits.



          Edit: if you say that spirit can only trade once per its own infinite lifetime, then either all spirits have traded already, or none are interested in trading.






          share|improve this answer






















          • I edited my question.
            – Sensei
            2 hours ago














          up vote
          3
          down vote



          accepted










          Free Trade is mutually beneficial by definition: each party values what it receives more than what it gives up.



          Spirit could get more actual spirit power from what the human gives up, or entertainment, or bragging rights.



          Spirits do not consume anything, but they need a source of power. Humans trade gives them that power. Even if they do not need power to survive, it can enable them to do more things, travel further, etc.



          Spirits need entertainment b/c their immortal lives leave them bored of most things, but they enjoy observing the randomness of human emotions and their reactions to powers and curses from spirit trade.



          Finally, even if humans themselves are not entertaining, there is competition between spirits on who can get a more powerful human to trade with them, or to give up the most. Kinda like fishing by humans, where you mainly brag about size of the fish.



          Note that while the trade is "forever", I assume it only lasts until the human dies. Which is a very short period of time for immortal spirits.



          Edit: if you say that spirit can only trade once per its own infinite lifetime, then either all spirits have traded already, or none are interested in trading.






          share|improve this answer






















          • I edited my question.
            – Sensei
            2 hours ago












          up vote
          3
          down vote



          accepted







          up vote
          3
          down vote



          accepted






          Free Trade is mutually beneficial by definition: each party values what it receives more than what it gives up.



          Spirit could get more actual spirit power from what the human gives up, or entertainment, or bragging rights.



          Spirits do not consume anything, but they need a source of power. Humans trade gives them that power. Even if they do not need power to survive, it can enable them to do more things, travel further, etc.



          Spirits need entertainment b/c their immortal lives leave them bored of most things, but they enjoy observing the randomness of human emotions and their reactions to powers and curses from spirit trade.



          Finally, even if humans themselves are not entertaining, there is competition between spirits on who can get a more powerful human to trade with them, or to give up the most. Kinda like fishing by humans, where you mainly brag about size of the fish.



          Note that while the trade is "forever", I assume it only lasts until the human dies. Which is a very short period of time for immortal spirits.



          Edit: if you say that spirit can only trade once per its own infinite lifetime, then either all spirits have traded already, or none are interested in trading.






          share|improve this answer














          Free Trade is mutually beneficial by definition: each party values what it receives more than what it gives up.



          Spirit could get more actual spirit power from what the human gives up, or entertainment, or bragging rights.



          Spirits do not consume anything, but they need a source of power. Humans trade gives them that power. Even if they do not need power to survive, it can enable them to do more things, travel further, etc.



          Spirits need entertainment b/c their immortal lives leave them bored of most things, but they enjoy observing the randomness of human emotions and their reactions to powers and curses from spirit trade.



          Finally, even if humans themselves are not entertaining, there is competition between spirits on who can get a more powerful human to trade with them, or to give up the most. Kinda like fishing by humans, where you mainly brag about size of the fish.



          Note that while the trade is "forever", I assume it only lasts until the human dies. Which is a very short period of time for immortal spirits.



          Edit: if you say that spirit can only trade once per its own infinite lifetime, then either all spirits have traded already, or none are interested in trading.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 2 hours ago

























          answered 2 hours ago









          Bald Bear

          5,146519




          5,146519











          • I edited my question.
            – Sensei
            2 hours ago
















          • I edited my question.
            – Sensei
            2 hours ago















          I edited my question.
          – Sensei
          2 hours ago




          I edited my question.
          – Sensei
          2 hours ago










          up vote
          1
          down vote













          They might take whatever the human gives up and use it to elevate themselves above a spirit






          share|improve this answer








          New contributor




          Aidan Kapur is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.

















          • Why would the human give something so big that it elevates the spirit? The human doesn't have to trade with the spirit.
            – Sensei
            3 hours ago











          • @Sensei trade is not a zero-sum game :)
            – Bald Bear
            2 hours ago














          up vote
          1
          down vote













          They might take whatever the human gives up and use it to elevate themselves above a spirit






          share|improve this answer








          New contributor




          Aidan Kapur is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.

















          • Why would the human give something so big that it elevates the spirit? The human doesn't have to trade with the spirit.
            – Sensei
            3 hours ago











          • @Sensei trade is not a zero-sum game :)
            – Bald Bear
            2 hours ago












          up vote
          1
          down vote










          up vote
          1
          down vote









          They might take whatever the human gives up and use it to elevate themselves above a spirit






          share|improve this answer








          New contributor




          Aidan Kapur is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          They might take whatever the human gives up and use it to elevate themselves above a spirit







          share|improve this answer








          New contributor




          Aidan Kapur is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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          share|improve this answer



          share|improve this answer






          New contributor




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          answered 3 hours ago









          Aidan Kapur

          112




          112




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          New contributor





          Aidan Kapur is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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          Aidan Kapur is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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          • Why would the human give something so big that it elevates the spirit? The human doesn't have to trade with the spirit.
            – Sensei
            3 hours ago











          • @Sensei trade is not a zero-sum game :)
            – Bald Bear
            2 hours ago
















          • Why would the human give something so big that it elevates the spirit? The human doesn't have to trade with the spirit.
            – Sensei
            3 hours ago











          • @Sensei trade is not a zero-sum game :)
            – Bald Bear
            2 hours ago















          Why would the human give something so big that it elevates the spirit? The human doesn't have to trade with the spirit.
          – Sensei
          3 hours ago





          Why would the human give something so big that it elevates the spirit? The human doesn't have to trade with the spirit.
          – Sensei
          3 hours ago













          @Sensei trade is not a zero-sum game :)
          – Bald Bear
          2 hours ago




          @Sensei trade is not a zero-sum game :)
          – Bald Bear
          2 hours ago










          up vote
          1
          down vote













          Collectors.



          car collection
          https://www.independent.co.uk/life-style/motoring/a-look-inside-the-car-collection-of-michael-fux-a7950721.html



          Why does this dude have so many cars? He can only drive one at a time. He has them because he can, and he likes them, and they are bragworthy beautiful things, and then when he visits his rich friends he has something to talk about. Maybe he trades cars with them because he likes specific types of cars for his collections.



          So too the spirits. They cannot really use the things the humans give them but they collect that kind of stuff. When the spirits get together they pore over their collections, trade, comment, brag and so on.



          One other thing a spirit could do is trade something a human gives up with another human. Fireball spirit might find someone who really wanted a sound nights sleep, and exchange for sleeping (which Fireball spirit has in its collection) will give up the ability to whistle through her nose. Fireball spirit is a whistling aficionado and so makes the swap and improves its collection of various whistling powers.






          share|improve this answer




















          • Once a trade is done, the spirit can't trade with anyone else forever.
            – Sensei
            2 hours ago










          • @Sensei. trade is a contract with a human. Shouldn't spirit be released from that contract once the human dies? That's how it works with contracts between humans ...
            – Bald Bear
            2 hours ago










          • @Sensei - one and done? That fireball spirit is tied to that one human waiting for the chance to make its fireball spell? It seems like one fireball spirit could have a lot of human customers. What is the chance they all want fireballs at once? A person probably goes days at a time with no call to make a fireball. .
            – Willk
            2 hours ago










          • @BaldBear makes sense, edited the question.
            – Sensei
            2 hours ago











          • @Willk trading is a divine action, and gods may not accept his swear if the spirit is already a servant for another human.
            – Sensei
            2 hours ago














          up vote
          1
          down vote













          Collectors.



          car collection
          https://www.independent.co.uk/life-style/motoring/a-look-inside-the-car-collection-of-michael-fux-a7950721.html



          Why does this dude have so many cars? He can only drive one at a time. He has them because he can, and he likes them, and they are bragworthy beautiful things, and then when he visits his rich friends he has something to talk about. Maybe he trades cars with them because he likes specific types of cars for his collections.



          So too the spirits. They cannot really use the things the humans give them but they collect that kind of stuff. When the spirits get together they pore over their collections, trade, comment, brag and so on.



          One other thing a spirit could do is trade something a human gives up with another human. Fireball spirit might find someone who really wanted a sound nights sleep, and exchange for sleeping (which Fireball spirit has in its collection) will give up the ability to whistle through her nose. Fireball spirit is a whistling aficionado and so makes the swap and improves its collection of various whistling powers.






          share|improve this answer




















          • Once a trade is done, the spirit can't trade with anyone else forever.
            – Sensei
            2 hours ago










          • @Sensei. trade is a contract with a human. Shouldn't spirit be released from that contract once the human dies? That's how it works with contracts between humans ...
            – Bald Bear
            2 hours ago










          • @Sensei - one and done? That fireball spirit is tied to that one human waiting for the chance to make its fireball spell? It seems like one fireball spirit could have a lot of human customers. What is the chance they all want fireballs at once? A person probably goes days at a time with no call to make a fireball. .
            – Willk
            2 hours ago










          • @BaldBear makes sense, edited the question.
            – Sensei
            2 hours ago











          • @Willk trading is a divine action, and gods may not accept his swear if the spirit is already a servant for another human.
            – Sensei
            2 hours ago












          up vote
          1
          down vote










          up vote
          1
          down vote









          Collectors.



          car collection
          https://www.independent.co.uk/life-style/motoring/a-look-inside-the-car-collection-of-michael-fux-a7950721.html



          Why does this dude have so many cars? He can only drive one at a time. He has them because he can, and he likes them, and they are bragworthy beautiful things, and then when he visits his rich friends he has something to talk about. Maybe he trades cars with them because he likes specific types of cars for his collections.



          So too the spirits. They cannot really use the things the humans give them but they collect that kind of stuff. When the spirits get together they pore over their collections, trade, comment, brag and so on.



          One other thing a spirit could do is trade something a human gives up with another human. Fireball spirit might find someone who really wanted a sound nights sleep, and exchange for sleeping (which Fireball spirit has in its collection) will give up the ability to whistle through her nose. Fireball spirit is a whistling aficionado and so makes the swap and improves its collection of various whistling powers.






          share|improve this answer












          Collectors.



          car collection
          https://www.independent.co.uk/life-style/motoring/a-look-inside-the-car-collection-of-michael-fux-a7950721.html



          Why does this dude have so many cars? He can only drive one at a time. He has them because he can, and he likes them, and they are bragworthy beautiful things, and then when he visits his rich friends he has something to talk about. Maybe he trades cars with them because he likes specific types of cars for his collections.



          So too the spirits. They cannot really use the things the humans give them but they collect that kind of stuff. When the spirits get together they pore over their collections, trade, comment, brag and so on.



          One other thing a spirit could do is trade something a human gives up with another human. Fireball spirit might find someone who really wanted a sound nights sleep, and exchange for sleeping (which Fireball spirit has in its collection) will give up the ability to whistle through her nose. Fireball spirit is a whistling aficionado and so makes the swap and improves its collection of various whistling powers.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 2 hours ago









          Willk

          93.6k22180400




          93.6k22180400











          • Once a trade is done, the spirit can't trade with anyone else forever.
            – Sensei
            2 hours ago










          • @Sensei. trade is a contract with a human. Shouldn't spirit be released from that contract once the human dies? That's how it works with contracts between humans ...
            – Bald Bear
            2 hours ago










          • @Sensei - one and done? That fireball spirit is tied to that one human waiting for the chance to make its fireball spell? It seems like one fireball spirit could have a lot of human customers. What is the chance they all want fireballs at once? A person probably goes days at a time with no call to make a fireball. .
            – Willk
            2 hours ago










          • @BaldBear makes sense, edited the question.
            – Sensei
            2 hours ago











          • @Willk trading is a divine action, and gods may not accept his swear if the spirit is already a servant for another human.
            – Sensei
            2 hours ago
















          • Once a trade is done, the spirit can't trade with anyone else forever.
            – Sensei
            2 hours ago










          • @Sensei. trade is a contract with a human. Shouldn't spirit be released from that contract once the human dies? That's how it works with contracts between humans ...
            – Bald Bear
            2 hours ago










          • @Sensei - one and done? That fireball spirit is tied to that one human waiting for the chance to make its fireball spell? It seems like one fireball spirit could have a lot of human customers. What is the chance they all want fireballs at once? A person probably goes days at a time with no call to make a fireball. .
            – Willk
            2 hours ago










          • @BaldBear makes sense, edited the question.
            – Sensei
            2 hours ago











          • @Willk trading is a divine action, and gods may not accept his swear if the spirit is already a servant for another human.
            – Sensei
            2 hours ago















          Once a trade is done, the spirit can't trade with anyone else forever.
          – Sensei
          2 hours ago




          Once a trade is done, the spirit can't trade with anyone else forever.
          – Sensei
          2 hours ago












          @Sensei. trade is a contract with a human. Shouldn't spirit be released from that contract once the human dies? That's how it works with contracts between humans ...
          – Bald Bear
          2 hours ago




          @Sensei. trade is a contract with a human. Shouldn't spirit be released from that contract once the human dies? That's how it works with contracts between humans ...
          – Bald Bear
          2 hours ago












          @Sensei - one and done? That fireball spirit is tied to that one human waiting for the chance to make its fireball spell? It seems like one fireball spirit could have a lot of human customers. What is the chance they all want fireballs at once? A person probably goes days at a time with no call to make a fireball. .
          – Willk
          2 hours ago




          @Sensei - one and done? That fireball spirit is tied to that one human waiting for the chance to make its fireball spell? It seems like one fireball spirit could have a lot of human customers. What is the chance they all want fireballs at once? A person probably goes days at a time with no call to make a fireball. .
          – Willk
          2 hours ago












          @BaldBear makes sense, edited the question.
          – Sensei
          2 hours ago





          @BaldBear makes sense, edited the question.
          – Sensei
          2 hours ago













          @Willk trading is a divine action, and gods may not accept his swear if the spirit is already a servant for another human.
          – Sensei
          2 hours ago




          @Willk trading is a divine action, and gods may not accept his swear if the spirit is already a servant for another human.
          – Sensei
          2 hours ago










          up vote
          1
          down vote













          The sacrifice actually carves off a portion of the person't soul or animating spirit. The spirit either consumes these pieces to sustain or enrich itself or it trades them to something that does use them.



          Maybe some high level being is creating an art installation: The concept of taste. It wants the ability to taste different things from several different beings (and the same thing since different people may taste salt differently) so it can perfect it's masterpiece.



          There could be a demon who hates humanity and is willing to pay for anything that diminishes humanity.



          The main thing is that the spirit itself may or may not be able to use those sacrifices but if the portion of the person the sacrifice represents can be traded, it doesn't matter.



          Also, if the other being are so different that they can't interact with the story universe, the spirits are going to be the only contact that the people have. Therefore the people will only know what the spirits tell them or what they can speculate (if the spirits don't talk about it).



          EDIT: [addition]



          If the spirit can truly only trade once (instead of once for each spell), maybe it is the trade that lets it evolve into the next higher form of spirit. Maybe the spirits are the grubs of the spirit world.






          share|improve this answer






















          • Nice answer. For the speculation part - there are legends and stories about people trading with spirits, so people already know about the spirits.
            – Sensei
            2 hours ago














          up vote
          1
          down vote













          The sacrifice actually carves off a portion of the person't soul or animating spirit. The spirit either consumes these pieces to sustain or enrich itself or it trades them to something that does use them.



          Maybe some high level being is creating an art installation: The concept of taste. It wants the ability to taste different things from several different beings (and the same thing since different people may taste salt differently) so it can perfect it's masterpiece.



          There could be a demon who hates humanity and is willing to pay for anything that diminishes humanity.



          The main thing is that the spirit itself may or may not be able to use those sacrifices but if the portion of the person the sacrifice represents can be traded, it doesn't matter.



          Also, if the other being are so different that they can't interact with the story universe, the spirits are going to be the only contact that the people have. Therefore the people will only know what the spirits tell them or what they can speculate (if the spirits don't talk about it).



          EDIT: [addition]



          If the spirit can truly only trade once (instead of once for each spell), maybe it is the trade that lets it evolve into the next higher form of spirit. Maybe the spirits are the grubs of the spirit world.






          share|improve this answer






















          • Nice answer. For the speculation part - there are legends and stories about people trading with spirits, so people already know about the spirits.
            – Sensei
            2 hours ago












          up vote
          1
          down vote










          up vote
          1
          down vote









          The sacrifice actually carves off a portion of the person't soul or animating spirit. The spirit either consumes these pieces to sustain or enrich itself or it trades them to something that does use them.



          Maybe some high level being is creating an art installation: The concept of taste. It wants the ability to taste different things from several different beings (and the same thing since different people may taste salt differently) so it can perfect it's masterpiece.



          There could be a demon who hates humanity and is willing to pay for anything that diminishes humanity.



          The main thing is that the spirit itself may or may not be able to use those sacrifices but if the portion of the person the sacrifice represents can be traded, it doesn't matter.



          Also, if the other being are so different that they can't interact with the story universe, the spirits are going to be the only contact that the people have. Therefore the people will only know what the spirits tell them or what they can speculate (if the spirits don't talk about it).



          EDIT: [addition]



          If the spirit can truly only trade once (instead of once for each spell), maybe it is the trade that lets it evolve into the next higher form of spirit. Maybe the spirits are the grubs of the spirit world.






          share|improve this answer














          The sacrifice actually carves off a portion of the person't soul or animating spirit. The spirit either consumes these pieces to sustain or enrich itself or it trades them to something that does use them.



          Maybe some high level being is creating an art installation: The concept of taste. It wants the ability to taste different things from several different beings (and the same thing since different people may taste salt differently) so it can perfect it's masterpiece.



          There could be a demon who hates humanity and is willing to pay for anything that diminishes humanity.



          The main thing is that the spirit itself may or may not be able to use those sacrifices but if the portion of the person the sacrifice represents can be traded, it doesn't matter.



          Also, if the other being are so different that they can't interact with the story universe, the spirits are going to be the only contact that the people have. Therefore the people will only know what the spirits tell them or what they can speculate (if the spirits don't talk about it).



          EDIT: [addition]



          If the spirit can truly only trade once (instead of once for each spell), maybe it is the trade that lets it evolve into the next higher form of spirit. Maybe the spirits are the grubs of the spirit world.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 2 hours ago

























          answered 2 hours ago









          ShadoCat

          14.2k1851




          14.2k1851











          • Nice answer. For the speculation part - there are legends and stories about people trading with spirits, so people already know about the spirits.
            – Sensei
            2 hours ago
















          • Nice answer. For the speculation part - there are legends and stories about people trading with spirits, so people already know about the spirits.
            – Sensei
            2 hours ago















          Nice answer. For the speculation part - there are legends and stories about people trading with spirits, so people already know about the spirits.
          – Sensei
          2 hours ago




          Nice answer. For the speculation part - there are legends and stories about people trading with spirits, so people already know about the spirits.
          – Sensei
          2 hours ago










          Sensei is a new contributor. Be nice, and check out our Code of Conduct.









           

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