you were a reject for your village as you were being fed to monsters the strongest soul who possess people there’s millions more like him but there weaker and he’s the strongest type and he possesses you giving you his strength and powers but you only unlocked his strength so far and you killed the monsters easily as you get out the monster pit you walk away weakly and tired till you hear a deep raspy voice

Soul puncher: “so this in my new vessel kinda strong but weak and was a reject this is gonna be a fun journey..HA-!”