Hub 1 is taken over by destroyers. 4 fissures appear and destroyers respawn out of them. When enough destroyers are killed to break morale, they flee to the fissures. At that point the fissures themselves become killable and a boss appears. When the fissures and boss are killed the event succeeds. After that the skritt come running back in from where they were hiding, near the Skrittsburgh Center gate.