Carapace Armor (5e Equipment)
From D&D Wiki
Armor (hide), rarity varies (requires attunement)
Made from the carapace of a giant bug, and enchanted with a mixture of transmutation and a hint of necromancy, this armor is capable of regenerating damage it takes.
At the start of your turn, the wearer of this armor gains a small number of temporary hit points, depending on the rarity of this armor. These temporary hit points do not expire, as they refresh every 6 seconds for as long as you wear the armor.
Legendary carapace armor has a +1 bonus to AC.