Ring of Invincibility

From Doom Wiki

The Valador's Ring of Invincibility is an artifact in Heretic. While wearing a Ring of Invincibility, the player is immune to all attack and has gold-tinted vision.

Heretic items
Health	Crystal Vial \| Quartz Flask \| Mystic Urn
Armor	Silver Shield \| Enchanted Shield
Items	Crystal Vial \| Map Scroll \| Bag of Holding \| Ammo
Artifacts	Chaos Device \| Morph Ovum \| Mystic Urn \| Quartz Flask \| Ring of Invincibility \| Shadowsphere \| Timebomb of the Ancients \| Tome of Power \| Torch \| Wings of Wrath