chahorsecha

been looking for ages can't find it
it starts with a boy reborn as a farmers child he ran away because his father was a abusive drunk he goes to a town to a adventurers guild he starts working there they give him a room he cleans for them at beginning when he takes his first bath he gets power cleanse he hears a voice and it unlocks power he than tries to clean the whole guild with cleanse the guild master runs up and finds him on floor well he can unlock powers and abilities just by doing a odd job like his blacksmithing even blacksmiths that held hammer for years just unlocked blacksmithing skill but he unlocks them like nothing the whole guild likes and protects him like when his father found out about him he came drunk and tried to drag him back home to work for him and can't remember but think some guy claimed he could live like a rich guy for life if he sold him to him or something like that and guild put a stop to that think at last remembered chapter they were talking about getting the royal family to back him up or something close to that

all I can remember is he wakes up as weak kid in school they have beast powers his is lizard that he evolves into a Godzilla like Trex creature with radioactive power and becomes the best in school and they are in post apocalyptic type place that beasts roam everywhere and on train they encounter them he jumps out to fight that is last I remember of it