Beta rune full helm

The Beta rune full helm can be smithed at a smithing level of 82 by Beta rune bars. You'll need an Defence level of 42 to equip it. If you lose it, you can get another by smithing it or searching in the crates outside Oziach's house. You can't cast High Level Alchemy on it.

Trivia
It resembles the rune full helm of RuneScape Classic.