[@KoL]

I made edits to his quirk to his explain his drawbacks more. I choose a stamina limit: if he just transforms and doesn't try to make himself move he could last about 30 minutes before his body gets too sore to maintain his boulder form. Trying to move around on his own while in boulder form also costs a lot of stamina, though if he is in a smaller form like a pebble or rock it doesn't take as much energy. If someone moves him around or if he transforms on a slope so he rolls down naturally also doesn't consume much stamina since he's not trying to make himself move, he's just letting the momentum carry him. Peter is still on a time limit even during these moments though. He still can't transform out of boulder form while he's moving though whether he means to or not, so using momentum to move around can be a double-edge sword if he's rolling towards something he doesn't want to hit.