Beast Weaver

Deal 8d20 slashing damage to one enemy. When you hit an enemy that is weak to slashing for the first time this turn, take one more action this turn. On a 16-20, deal double damage and act as if you hit a weakness. Does not work on enemies that nullify slashing. For the next 3 turns, attacks deal x0.10 damage after other modifiers. Costs 22% hp.

(This is for a homebrew persona campaign I'm making. More Personas and spells will be made as time goes on. A feat has already been made called the "Persona User (Wild Card). If anyone has any tips, feel free to provide them)