Hulking Cursed-Blood

As a hulking cursed-blood, you have remarkable resilience, akin to the great demons of old. You’re probably on the tall side for a cursed-blood, and the scales on your skin look as if made of stone—obsidian and marble are the two most common colors, but flesh akin to rubies, sapphires, or other precious stones also exist.
Ability Score Increase. One ability score increases by 1.
Stone Skin. When you suffer a critical hit from an attack that deals piercing damage, the attack doesn’t deal extra piercing damage to you from being a critical hit.