race features:
Stone Skin: Because of your non-organic nature, you gain a resitance to poison damage
Stocky: Wearing heavy armor does not decrees you max speed
Crumble: As a bonus action you may crumble into a pile of rocks once between short rests. While crumbled, you are considered hidden, and you can only be found with an investigation check with a DC of 12 plus you stealth modifer. In addition, while crumbled you cannot move, attack, or take any action involving moving without revaling yourself. Any damage taken instantly ends this condition, revaling you to everyone.