Ademantium Armor

Uncommon

Armor (heavy), uncommonMade by fomorians for a demonic subordinate, this armor crackles with hellish energy and is marked with Yeenoghu’s symbol. The symbol can be removed by hand, but the faint smell of blood can never be removed. This suit of armor is reinforced with adamantine, one of the hardest substances in existence. While you're wearing it, any critical hit against you becomes a normal hit. This item can be found in the Dungeon Master’s Guide