Five Elements - Paper Charms

I have taken a little time to help make this feat a little more developed because I think it's a wonderful idea. However, it seems to leave a lot of questions on how to use it. You can copy and past the below section into a new revision if you like. I will also put in a few notes on why I made the changes I've made at the bottom.

You have learned how to fuse the elements into paper to do your will. 

• You spend 1 hour to make each charm. The charm requires one piece of paper to make and is destroyed after one use. You can make up to 5 charms per day. Charms lose their magic after 3 days.
  • Choose fire, earth, wind, or water. 
    • if you choose fire the damage type is fire.
    • if you choose earth the damage type is bludgeoning.
    • if you choose wind the damage type is thunder.
    • if you choose water the damage type is cold.
  • As an action you can use a charm to make a ranged spell attack on a creature within 60 feet.  The target makes a Dexterity saving throw (DC 15) on a failed save, the target takes 2d10 of the damage type associated to that specific charm.
  • As a Bonus action you can stick a charm to any floor, wall, ceiling, door, or object. If a creature gets within 10 feet of the charm it must make a Dexterity saving throw (DC 15) on a failed save, the target takes 2d10 of the damage type associated to that specific charm.
  • When a creature within 5 feet of you attacks you with a Melee weapon attack you can use your reaction to use a charm to create a wall between you and the creature that lasts until the end of your next turn. When the wall appears the attacking creature must make a Dexterity saving throw (DC 15) on a failed save, the target takes 2d10 of the damage type associated to that specific charm. The wall is 10 foot high and 10 foot wide. 

Notes: I felt that one day was too long of a time to make a charm. I also felt that there should be a limit to the amount of charms you can make and how long they last so you don't end up with a bunch of charms laying around. The charms needed damage types that are recognized by the mechanics of the game. The wall part needed a trigger for the reaction.  I took out all the half damage because the charms are so versatile in their use. 

I agree that the wall needs a Trigger, so any time you see a spell being cast, or an arrow being shot at you, being charged, ect ect, 

I also agree you should use damage types that are recognized by the mechanics of the game, but also the effects of that type apply, Ex. cold slows you down.

I picked 1 per day because they need to be hard to make, you can have 100, 200, a whole book, and you can cast one as an action, bonus action, and reaction every turn.

but at the end of the day, if you are worried about having too many or too few just incorporate economics, buy, sell, and trade.

This is fantastic! Thanks, OP for the original idea, and thanks to Adaligogh for your work on refining it. I'll probably tweak it a bit for my own uses, but I'm definitely letting one of my characters play with this toy. 

thanks, let me know how it goes. ^^