Hellfire Armor

Armor (any metal), rarity varies

This spiked armor is a dark, almost black crimson when inactive.

Hellfire Armor (Common). While wearing this armor, you can use an action to cause it to glow and appear red-hot, giving you a hellish appearance. The armor sheds light as a candle, but it doesn’t emit heat. The effect lasts until you use a bonus action to end it.

Molten Hellfire Armor (Uncommon). This more powerful version of hellfire armor has 3 charges. It regains all expended charges daily at dawn. If you expend 1 charge as part of the action to make the armor glow, you can make the armor emit heat in addition to light for 1 minute. For the duration, when a creature touches you or hits you with a melee attack while within 5 feet of you, it takes 1d4 fire damage. You are immune to the armor’s heat while wearing it.