The greatest works of Zircon of Minoc, the Mystic Armour was first found by the Stranger and Companions, after all eight Shrines gave the Stranger partial Avatarhood. Scatu of the Lycaeum could be found wearing a suit of Mystic Armour, and would give information about it. Following several clues, they were able to get their location from Sir Simon. These special robes were found in Empath Abbey, in a secret place in the Oak Grove. With the help of this armour, they managed to withstand the foes that blocked their way in the Abyss.
Thought lost after this, the Avatar found them again in the Underworld in Ultima V, in a lava pool under the Abyss, near the dungeon Hythloth. This armour again proved its worth, protecting against the foes in dungeon Doom.
It is unknown what happened to it after this.