Dwalimar hailed from Halruaa. In one of the adventures he undertook for the Netyarch, he acquired the Astrolabe of Nimbral for his nation. Years later, the Netyarch Zalathorm Kirkson gave Omen the mission of finding and destroying dangerously powerful artifacts using the Astrolabe. However, the astrolabe was destroyed during the Time of Troubles. At one point, Omen contracted a curse that was slowly killing him.
Omen had a hot temper and a huge ego but was a fatherly figure for his crew. Omen used to be pompous and stern to impress people and charming when he wanted something. His disease could leave him very moody. However, a difficult task would galvanize Omen and he would forget his condition for a time. Omen first and foremost thought about protecting people from those that abused their power.