Altuhet's Tomb is presumably located within the Tombs of the Precursors area in Uldum, though it doesn't appear in the game. Altuhet was an ancient Tol'vir and prophet who both constructed and used the weapon hidden within Nahom to drive away scores of attackers. He left behind tablets of his feat, but the Neferset smashed those tablets while looting the Tombs.
Players help enough of them for and the to discover what they s to restore the temple's weapon. This happens in the nick of time, as the in large waves attempting to crush the Ramkahen outpost.