Slit518
Adventurer
This is a really cool visual concept you have for the Stonewalls.
Do they get something like the Goliath's Stone's Endurance trait? It would make perfect sense to me.
They get a bonus to unarmored armor class due to having heavily calloused skin.
And perhaps a flat "1" Damage Reduction to all damage but Psychic, just because of their hard, calloused skin.
Interesting . . . Aside from the sub-race idea, they remind me of the Vahnatai from the Avernum computer game series, if the Vahnatai had died out.
If you're unfamiliar with the Vahnatai, they were basically seven-foot tall Roswell Grays that lived in the Underdark, were a precursor race to most every other humanoid life-form, wielded flambergs in battle, and channeled their memories and magical powers into crystals.
I have not heard of them, they sound really cool. I played maybe an hour of the first Avernum game, I went underground in the first area you go to, and went around the dungeon a bit. It seems really large.