Big PP smash

As you prepare for battle you look over, the bard seems to be casting an odd spell. suddenly you see them summon up a PP. Oh bards, always up to the weirdest things.

You conjure up a big PP.  Roll 1d100. Anything under 70 fails and dispels the spell. 70 and above works and you do 3d20. On the rare case you roll a perfect 100 you roll 1d100 for damage. After using this spell you get 1 level of exhaustion.

this is my first spell its sort of a joke within my friend group because i added it on my friends sheet