This underlay is worn under a suit of armor and 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 adds some additional protection to the weak spots in any armor it's worn under, granting +1 to AC

This item takes one hour to combine with any one medium or heavy suit of armor. This item cannot be used without first combining it with armor.

Notes: Immunity: Critical Hits, Bonus: Armor Class, artificer, cleric, fighter, paladin, blood hunter or ranger, Combat, Warding