Dream Needle

Deal 1d8 piercing damage to one enemy. When you hit an enemy that is weak to piercing for the first time this turn, take one more action this turn. Costs 10%hp. On a natural 20, deal 2d8 and act as if you hit the enemies weakness. On rolls of 18 or higher, put the foe to sleep for three turns or until they're cured

(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)