Bracers of the Dawnbringer (5e Equipment)
From D&D Wiki
Wondrous item, very rare (requires attunement)
These bronze bracers are ornately decorated with a gold finish, and seem to emit a dull red glow.
Searing Fire. Whenever you deal radiant or fire damage, as a bonus action, you can make the deal 1d8 additional fire or radiant damage.
Spreading Blaze. Whenever you kill a creature with radiant or fire damage, the flames cover the creature and almost seem to expand. Any creature within 5 feet of the creature that you killed takes 2d6 fire or radiant damage.
Flame Protection. All fire and radiant damage you take is reduced by 3.