Chaotic Fist

Manifest chaotic energy into your fist, either being insanely powerful or insanely weak depending on how lucky you are.

Roll [roll]1d20[/roll], no modifiers, to decide how effective the spell is.

1-10: No effect
11-19: (The level of whatever magic class you are)d10+10
20: 2/3 of the target's max health

(I'm not sure if this if overpowered or not)