Resistant Armor
Source: Tasha’s Cauldron of Everything p. 23, Eberron: Rising from the Last War p. 63
Prerequisite: 6th-level Artificer, A suit of armor (requires attunement)
While wearing this armor, a creature has resistance to one of the following damage types, which you choose when you infuse the item: acid, cold, fire, force, lightning, necrotic, poison, psychic, radiant, or thunder.