Get rid of the garrison of the Asteria Fortress with your colleagues and report the result to Garpedo.
Step 1. Get rid of Asteria Fortress GarrisonA force of Asmodians or Balaur that appears when the Asteria Fortress is Invulnerable. The Garrison is comprised of Fortress Snipers, Fortress Gallowglasses, Fortress Mages, and Fortress Priests.s (x10).
Step 2. Report the result to GarpedoA Protector of Teminon Legionary at Clocktower Plain. He wants the war to end..