Agneyastra

Deal 3d12 piercing damage to all enemies. When you hit an enemy that is weak to piercing for the first time this turn, take one more action this turn. On a 20, deal double damage and act as if you hit a weakness. Does not work on enemies that nullify piercing. Costs 24% 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)