Infernal Aegis

Armor - very rare - requires attunement

While holding this shield, you can speak its command word as a bonus action to cause it to become wreathed in harmless, magical flames. The flames cast bright light in a 20-foot radius and dim light for another 20 feet. The flames last until you speak its command word again as a bonus action or until you drop or doff the shield.

While holding the shield, you have a +1 bonus to AC as well as resistance to fire damage. This bonus is in addition to the shield’s normal bonus to AC. In addition, the shield has 4 charges and regains 1d4 expended charges daily at dawn. While the shield is ablaze, you can expend 1 or more of its charges to cast the fire shield (2 charges, warm shield only) or hellish rebuke (1 charge, save DC 16) spell from it.

The hells are a place no one should hope to go. That said, my time there was fruitful. Yours probably won't be, though.