Doomion

Doomion is a demon encountered during the Underground Pass quest, and can only be fought during the quest. When killed he drops the Amulet of doomion, which is needed to obtain Iban's shadow. Protect from Melee should be used during this part of the quest to save life points for the other fights.

Trivia

 * It is possible to use the small bridges connecting the platforms as a safe spot to attack using Ranged, Magic, or with a halberd.
 * It is possible that jagex got the name from the son of satan, Damien.
 * The demon's name was shaped into doomion by adding the world doom into damien, which refers to the son of satan.