Optus Ulios, Coalition Ally

Optus Ulios, Coalition Ally is a Cabal Psion and an Optus of the Imperial Cabal. They twice accompanied Empress Caiatl to the Underbelly of the Derelict Leviathan when she went in there to challenge the Nightmare of Dominus Ghaul.

Overview
Ulios wears the same armor that is typical of other Imperial Opti: bulky, dark-grey armor with gold markings and Caiatl's sigil emblazoned on their chest piece, and black capes with a large, white symbol on it, with blue areas near the end. They come equipped with the rifle variant of the Cabal Slug Launcher.

Ulios appears within the Leviathan's Underbelly in the final two Sever Missions: Rage and Resolve. In both missions, you will run into them when you reach the Ventilator, after fighting through the Engineering Bay alongside Val Parthus and Bracus Lume. He will wait for The Guardian to lift the lockdown, lowering the energy barrier blocking the group and allowing them to push onward to Caiatl's position. In Resolve, large numbers of Scorn will appear in the airshaft, attempting to stop you from making it to your objective, and Ulios will fight by your side against them. They will stop alongside the other Cabal just short of the final boss arena, guarduing the entrance while you take on the Nightmare of Ghaul. They will transmat away when the mission ends.

List of appearances

 * Destiny 2
 * Season of the Haunted