Can an 18th level hastened mobile wood-elf monk move at over 100 mph?

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One of my players wants to say his monk can kill a T-Rex in a single blow, by simply ramming it. The pitch goes like this:



  • As a wood elf he has a base speed of 35 feet.

  • The Mobile feat increases this to 45.

  • Being 18th level monk adds +30, so we're at 75 ft.

  • His wizard friend casts Haste on him. Being under the haste spell doubles his speed, to 150, and adds an action.

  • Dash doubles the 150 speed to 300.

  • Having two actions from Haste means he can Dash twice, so that's 600 feet of movement.

  • Finally, he can spend 1 ki point for Step of the Wind and thus Dash one more time as a bonus action. So we arrive at 900 feet of movement, in a turn lasting 6 seconds.

Now do the math: 900 feet per six seconds equates to 102 mph.



Something being hit by an object weighing as much as Medium humanoid that is traveling 100 mph, well, Ouch. But never mind killing a T-Rex. My question is, can he really go 100 mph? Every DM instinct I have says, this has gotta be wrong. Is it?










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  • 1




    I hope your friend is aware that he's going to kill himself as well. Hitting a solid object at 100mph is quite fatal to humanoids.
    – Erik
    1 hour ago














up vote
3
down vote

favorite












One of my players wants to say his monk can kill a T-Rex in a single blow, by simply ramming it. The pitch goes like this:



  • As a wood elf he has a base speed of 35 feet.

  • The Mobile feat increases this to 45.

  • Being 18th level monk adds +30, so we're at 75 ft.

  • His wizard friend casts Haste on him. Being under the haste spell doubles his speed, to 150, and adds an action.

  • Dash doubles the 150 speed to 300.

  • Having two actions from Haste means he can Dash twice, so that's 600 feet of movement.

  • Finally, he can spend 1 ki point for Step of the Wind and thus Dash one more time as a bonus action. So we arrive at 900 feet of movement, in a turn lasting 6 seconds.

Now do the math: 900 feet per six seconds equates to 102 mph.



Something being hit by an object weighing as much as Medium humanoid that is traveling 100 mph, well, Ouch. But never mind killing a T-Rex. My question is, can he really go 100 mph? Every DM instinct I have says, this has gotta be wrong. Is it?










share|improve this question

















  • 1




    I hope your friend is aware that he's going to kill himself as well. Hitting a solid object at 100mph is quite fatal to humanoids.
    – Erik
    1 hour ago












up vote
3
down vote

favorite









up vote
3
down vote

favorite











One of my players wants to say his monk can kill a T-Rex in a single blow, by simply ramming it. The pitch goes like this:



  • As a wood elf he has a base speed of 35 feet.

  • The Mobile feat increases this to 45.

  • Being 18th level monk adds +30, so we're at 75 ft.

  • His wizard friend casts Haste on him. Being under the haste spell doubles his speed, to 150, and adds an action.

  • Dash doubles the 150 speed to 300.

  • Having two actions from Haste means he can Dash twice, so that's 600 feet of movement.

  • Finally, he can spend 1 ki point for Step of the Wind and thus Dash one more time as a bonus action. So we arrive at 900 feet of movement, in a turn lasting 6 seconds.

Now do the math: 900 feet per six seconds equates to 102 mph.



Something being hit by an object weighing as much as Medium humanoid that is traveling 100 mph, well, Ouch. But never mind killing a T-Rex. My question is, can he really go 100 mph? Every DM instinct I have says, this has gotta be wrong. Is it?










share|improve this question













One of my players wants to say his monk can kill a T-Rex in a single blow, by simply ramming it. The pitch goes like this:



  • As a wood elf he has a base speed of 35 feet.

  • The Mobile feat increases this to 45.

  • Being 18th level monk adds +30, so we're at 75 ft.

  • His wizard friend casts Haste on him. Being under the haste spell doubles his speed, to 150, and adds an action.

  • Dash doubles the 150 speed to 300.

  • Having two actions from Haste means he can Dash twice, so that's 600 feet of movement.

  • Finally, he can spend 1 ki point for Step of the Wind and thus Dash one more time as a bonus action. So we arrive at 900 feet of movement, in a turn lasting 6 seconds.

Now do the math: 900 feet per six seconds equates to 102 mph.



Something being hit by an object weighing as much as Medium humanoid that is traveling 100 mph, well, Ouch. But never mind killing a T-Rex. My question is, can he really go 100 mph? Every DM instinct I have says, this has gotta be wrong. Is it?







dnd-5e rules-as-written optimization






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asked 1 hour ago









Valley Lad

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4118







  • 1




    I hope your friend is aware that he's going to kill himself as well. Hitting a solid object at 100mph is quite fatal to humanoids.
    – Erik
    1 hour ago












  • 1




    I hope your friend is aware that he's going to kill himself as well. Hitting a solid object at 100mph is quite fatal to humanoids.
    – Erik
    1 hour ago







1




1




I hope your friend is aware that he's going to kill himself as well. Hitting a solid object at 100mph is quite fatal to humanoids.
– Erik
1 hour ago




I hope your friend is aware that he's going to kill himself as well. Hitting a solid object at 100mph is quite fatal to humanoids.
– Erik
1 hour ago










2 Answers
2






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5
down vote













No



Unless I missed something, this is not how dash works.




Having two actions from Haste means he can Dash twice, so that's 600 feet of movement.




Dash says




When you take the Dash action, you gain extra Movement for the current turn. The increase equals your speed, after applying any modifiers.




Note that Dash does not increase your speed, it just gives you extra movement. Your speed is 150 ft at that point, and so is your movement. Using 3 dashes (two from actions and one from bonus action) will increase your movement by 3*150 = 450 ft to a total of 600 ft, which equals 68mph and is, therefore, less than 100 mph.






share|improve this answer






















  • I like this. So we've got him down to 70 mph! That's a start. What damage that would do on a "hit" (ram? body-slam?) is obviously for a separate question.
    – Valley Lad
    1 hour ago










  • @ValleyLad mind you, the monk would also take massive damage ^^
    – PixelMaster
    56 mins ago










  • Also, RAW, damage would be... zero. Not amazing I guess.
    – HellSaint
    49 mins ago

















up vote
1
down vote













Not really.



The speed with haste is correct, but you make some mistakes with the Dash action. Dashing does not double a creature's speed, rather it grants a creature extra movement equal to its speed1. Therefore the wood elf monk would move 600 feet per turn2.



Regardless, that's not even close to the top speed a player character can reach. For example a hasted Tabaxi monk can go 1120 feet per turn3. Several other spells, magic items, and class dips can push that figure well over 2000 feet per turn.



However, none of this means that character should be able to collide with another creature for massive damage. D&D certainly has no rules for doing so. The closest thing is falling damage, but that is only meant to handle creature-to-ground collisions.




  1. The Dash action says:


    When you take the Dash action, you gain extra movement for the current turn. The increase equals your speed, after applying any modifiers.




  2. Base hasted speed = (35+10+30)*2 = 150. Feet per turn = speed * (movement + 3 dahses) = 150*4 = 600.

  3. Base hasted speed = (30+10+30)*2 = 140. Feet per turn = speed * (movement + 3 dahses) * (feline agility) = 140*4*2 = 1120.





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    2 Answers
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    2 Answers
    2






    active

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    active

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    up vote
    5
    down vote













    No



    Unless I missed something, this is not how dash works.




    Having two actions from Haste means he can Dash twice, so that's 600 feet of movement.




    Dash says




    When you take the Dash action, you gain extra Movement for the current turn. The increase equals your speed, after applying any modifiers.




    Note that Dash does not increase your speed, it just gives you extra movement. Your speed is 150 ft at that point, and so is your movement. Using 3 dashes (two from actions and one from bonus action) will increase your movement by 3*150 = 450 ft to a total of 600 ft, which equals 68mph and is, therefore, less than 100 mph.






    share|improve this answer






















    • I like this. So we've got him down to 70 mph! That's a start. What damage that would do on a "hit" (ram? body-slam?) is obviously for a separate question.
      – Valley Lad
      1 hour ago










    • @ValleyLad mind you, the monk would also take massive damage ^^
      – PixelMaster
      56 mins ago










    • Also, RAW, damage would be... zero. Not amazing I guess.
      – HellSaint
      49 mins ago














    up vote
    5
    down vote













    No



    Unless I missed something, this is not how dash works.




    Having two actions from Haste means he can Dash twice, so that's 600 feet of movement.




    Dash says




    When you take the Dash action, you gain extra Movement for the current turn. The increase equals your speed, after applying any modifiers.




    Note that Dash does not increase your speed, it just gives you extra movement. Your speed is 150 ft at that point, and so is your movement. Using 3 dashes (two from actions and one from bonus action) will increase your movement by 3*150 = 450 ft to a total of 600 ft, which equals 68mph and is, therefore, less than 100 mph.






    share|improve this answer






















    • I like this. So we've got him down to 70 mph! That's a start. What damage that would do on a "hit" (ram? body-slam?) is obviously for a separate question.
      – Valley Lad
      1 hour ago










    • @ValleyLad mind you, the monk would also take massive damage ^^
      – PixelMaster
      56 mins ago










    • Also, RAW, damage would be... zero. Not amazing I guess.
      – HellSaint
      49 mins ago












    up vote
    5
    down vote










    up vote
    5
    down vote









    No



    Unless I missed something, this is not how dash works.




    Having two actions from Haste means he can Dash twice, so that's 600 feet of movement.




    Dash says




    When you take the Dash action, you gain extra Movement for the current turn. The increase equals your speed, after applying any modifiers.




    Note that Dash does not increase your speed, it just gives you extra movement. Your speed is 150 ft at that point, and so is your movement. Using 3 dashes (two from actions and one from bonus action) will increase your movement by 3*150 = 450 ft to a total of 600 ft, which equals 68mph and is, therefore, less than 100 mph.






    share|improve this answer














    No



    Unless I missed something, this is not how dash works.




    Having two actions from Haste means he can Dash twice, so that's 600 feet of movement.




    Dash says




    When you take the Dash action, you gain extra Movement for the current turn. The increase equals your speed, after applying any modifiers.




    Note that Dash does not increase your speed, it just gives you extra movement. Your speed is 150 ft at that point, and so is your movement. Using 3 dashes (two from actions and one from bonus action) will increase your movement by 3*150 = 450 ft to a total of 600 ft, which equals 68mph and is, therefore, less than 100 mph.







    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited 57 mins ago









    PixelMaster

    6,7192180




    6,7192180










    answered 1 hour ago









    HellSaint

    17.1k467144




    17.1k467144











    • I like this. So we've got him down to 70 mph! That's a start. What damage that would do on a "hit" (ram? body-slam?) is obviously for a separate question.
      – Valley Lad
      1 hour ago










    • @ValleyLad mind you, the monk would also take massive damage ^^
      – PixelMaster
      56 mins ago










    • Also, RAW, damage would be... zero. Not amazing I guess.
      – HellSaint
      49 mins ago
















    • I like this. So we've got him down to 70 mph! That's a start. What damage that would do on a "hit" (ram? body-slam?) is obviously for a separate question.
      – Valley Lad
      1 hour ago










    • @ValleyLad mind you, the monk would also take massive damage ^^
      – PixelMaster
      56 mins ago










    • Also, RAW, damage would be... zero. Not amazing I guess.
      – HellSaint
      49 mins ago















    I like this. So we've got him down to 70 mph! That's a start. What damage that would do on a "hit" (ram? body-slam?) is obviously for a separate question.
    – Valley Lad
    1 hour ago




    I like this. So we've got him down to 70 mph! That's a start. What damage that would do on a "hit" (ram? body-slam?) is obviously for a separate question.
    – Valley Lad
    1 hour ago












    @ValleyLad mind you, the monk would also take massive damage ^^
    – PixelMaster
    56 mins ago




    @ValleyLad mind you, the monk would also take massive damage ^^
    – PixelMaster
    56 mins ago












    Also, RAW, damage would be... zero. Not amazing I guess.
    – HellSaint
    49 mins ago




    Also, RAW, damage would be... zero. Not amazing I guess.
    – HellSaint
    49 mins ago












    up vote
    1
    down vote













    Not really.



    The speed with haste is correct, but you make some mistakes with the Dash action. Dashing does not double a creature's speed, rather it grants a creature extra movement equal to its speed1. Therefore the wood elf monk would move 600 feet per turn2.



    Regardless, that's not even close to the top speed a player character can reach. For example a hasted Tabaxi monk can go 1120 feet per turn3. Several other spells, magic items, and class dips can push that figure well over 2000 feet per turn.



    However, none of this means that character should be able to collide with another creature for massive damage. D&D certainly has no rules for doing so. The closest thing is falling damage, but that is only meant to handle creature-to-ground collisions.




    1. The Dash action says:


      When you take the Dash action, you gain extra movement for the current turn. The increase equals your speed, after applying any modifiers.




    2. Base hasted speed = (35+10+30)*2 = 150. Feet per turn = speed * (movement + 3 dahses) = 150*4 = 600.

    3. Base hasted speed = (30+10+30)*2 = 140. Feet per turn = speed * (movement + 3 dahses) * (feline agility) = 140*4*2 = 1120.





    share|improve this answer


























      up vote
      1
      down vote













      Not really.



      The speed with haste is correct, but you make some mistakes with the Dash action. Dashing does not double a creature's speed, rather it grants a creature extra movement equal to its speed1. Therefore the wood elf monk would move 600 feet per turn2.



      Regardless, that's not even close to the top speed a player character can reach. For example a hasted Tabaxi monk can go 1120 feet per turn3. Several other spells, magic items, and class dips can push that figure well over 2000 feet per turn.



      However, none of this means that character should be able to collide with another creature for massive damage. D&D certainly has no rules for doing so. The closest thing is falling damage, but that is only meant to handle creature-to-ground collisions.




      1. The Dash action says:


        When you take the Dash action, you gain extra movement for the current turn. The increase equals your speed, after applying any modifiers.




      2. Base hasted speed = (35+10+30)*2 = 150. Feet per turn = speed * (movement + 3 dahses) = 150*4 = 600.

      3. Base hasted speed = (30+10+30)*2 = 140. Feet per turn = speed * (movement + 3 dahses) * (feline agility) = 140*4*2 = 1120.





      share|improve this answer
























        up vote
        1
        down vote










        up vote
        1
        down vote









        Not really.



        The speed with haste is correct, but you make some mistakes with the Dash action. Dashing does not double a creature's speed, rather it grants a creature extra movement equal to its speed1. Therefore the wood elf monk would move 600 feet per turn2.



        Regardless, that's not even close to the top speed a player character can reach. For example a hasted Tabaxi monk can go 1120 feet per turn3. Several other spells, magic items, and class dips can push that figure well over 2000 feet per turn.



        However, none of this means that character should be able to collide with another creature for massive damage. D&D certainly has no rules for doing so. The closest thing is falling damage, but that is only meant to handle creature-to-ground collisions.




        1. The Dash action says:


          When you take the Dash action, you gain extra movement for the current turn. The increase equals your speed, after applying any modifiers.




        2. Base hasted speed = (35+10+30)*2 = 150. Feet per turn = speed * (movement + 3 dahses) = 150*4 = 600.

        3. Base hasted speed = (30+10+30)*2 = 140. Feet per turn = speed * (movement + 3 dahses) * (feline agility) = 140*4*2 = 1120.





        share|improve this answer














        Not really.



        The speed with haste is correct, but you make some mistakes with the Dash action. Dashing does not double a creature's speed, rather it grants a creature extra movement equal to its speed1. Therefore the wood elf monk would move 600 feet per turn2.



        Regardless, that's not even close to the top speed a player character can reach. For example a hasted Tabaxi monk can go 1120 feet per turn3. Several other spells, magic items, and class dips can push that figure well over 2000 feet per turn.



        However, none of this means that character should be able to collide with another creature for massive damage. D&D certainly has no rules for doing so. The closest thing is falling damage, but that is only meant to handle creature-to-ground collisions.




        1. The Dash action says:


          When you take the Dash action, you gain extra movement for the current turn. The increase equals your speed, after applying any modifiers.




        2. Base hasted speed = (35+10+30)*2 = 150. Feet per turn = speed * (movement + 3 dahses) = 150*4 = 600.

        3. Base hasted speed = (30+10+30)*2 = 140. Feet per turn = speed * (movement + 3 dahses) * (feline agility) = 140*4*2 = 1120.






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        edited 1 min ago

























        answered 27 mins ago









        Ruse

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