Absorption Armor (5e Equipment)
From D&D Wiki
Armor (light, medium, or heavy), very rare (requires attunement)
This armor glows with faint magical energy, and seems to be able to ward off almost any blow. The magical armor has 5 charges. Whenever you take acid, bludgeoning, cold, fire, lightning, piercing, slashing or thunder damage, you can spend 1 charge and use your reaction to gain resistance to one of the damage types that damaged you until the start of your next turn.
This armor regains 1d4 + 1 charges at dawn.