From Unofficial Homecoming Wiki
Heroes can find him:
- on the Bring back the missing scanners mission from Maria Jenkins (Levels 45 - 50)
- on the Shut down Siege's factory mission from Maria Jenkins (Levels 45 - 50)
Heroes and Villains face him as part of the Behavioral Adjustment Facility Trial
Siege, the Praetorian version of Citadel, has long since abandoned his old body and now uses whatever shell is appropriate for the job at hand.