you guys mite not rely on spells but here's one to become a demon slayer

wet a cross with holy water and chant 3x:

oh dear lord hear my cry, I wish to rid this world of the evil inside. grant me powers to banish each demon

from this world. send me a weapon to face the creachers of the night, and grant me protection so I may

keep my promise oh lord, TO RID EACH DEMON FROM THIS WORLD,so bless it be