race features:
Rock Muncher. With sharp teeth of stone, rock trolls with their sharp teeth can munch on rocks & ores like their regular food. Unaramed strikes can be through bites, dealing 1d6 + Str peircing damage.
Body of Stone. With a body of stone, rock trolls are immune to the poisned, & petrified conditions, & resitent to posion damage.
Alkaline Sweat. Cracks in the body sweat a mixture of alkaline materials, creating an exposive layer of skin. Alkaline rock trolls must apply a layer of oil or other covering to their skin every 24 hours, or else the sweated miture will react with the avaliable air. When not covered, at the end of alkaline trolls turn, they take 1d12 fire damage, as well as any creatures within 5ft who fail a DC 12 Dex save.
Iner Induced Explosion. Alkaline rock trolls can reroll any strength roll after using a reaction to inhale deaply, & use the proceding explosions within their inner cracks to propel their muscles, taking as recoil 2d6 fire damage which can't be reduced. Usable an amount of times equal to the trolls proficency bonus.