The Adamantium Helm of Tohan is a legendary Adamantium artifact. The helmet is medium weight, while still being very durable and offering superior protection. It has an immensely high potential for enchantment. Nothing is known of Tohan or the helm's origins.
The helm came to rest in the ruins of Onnissiralis, a shrine to Sheogorath located on a small island in the Sheogorad region of Vvardenfell, far west of Dagon Fel. It was kept in a tightly locked chest, openable only by key. In the late Third Era, a Dunmer man by the name of Norvayne attempted to cleanse the ruins, but was slain by the Daedra worshippers. Years later, in 3E 427, his sons, Daris and Dalin Norvayne, set out to avenge their father and cleanse the ruins. Following rumors of the Helm of Tohan, the Nerevarine arrived at Onnissiralis. The brothers disagreed on whether to accept the Nerevarine's aid or not. It is unknown how the events unfolded, but the ruins were cleansed of worshippers. The brothers handed the Nerevarine the key to the chest which contained the helm, and it was taken from the ruins.
- For game-specific information, see the Morrowind entry.