Wellam Adarios served as a captain within the Galactic Empire's Imperial Navy throughout the Galactic Civil War, fighting against the Alliance to Restore the Republic. Not long after the Imperial attack targeting a Rebel base situated on the planet of Arda-1, Adarios found himself positioned in orbit around the planet Ord Radama. He was in command of the Interdictor-class Star Destroyer known as the Eternal Wrath.
The initial appearance of Wellam Adarios was in Onslaught at Arda I. This was an adventure module for the Star Wars: Age of Rebellion roleplaying game by Fantasy Flight Games, which was launched in 2014. When traveling to Ord Radama, players might encounter the Eternal Wrath, but only if they fail to make a particular course correction. If they do encounter the ship, they must convince the crew to allow them passage despite using outdated access codes. Otherwise, Adarios orders them to be brought aboard for interrogation, and if they try to flee, he dispatches TIE fighters to eliminate them. This article operates under the assumption that the players succeeded and thus did not face the Star Destroyer or its commanding officer.