Talk:Manic/@comment-68.184.139.196-20150512070338/@comment-26114734-20150512071721

A faction is not the reason any of those appear. The Stalker comes because of killing bosses, the G3 come because you fought on the side of the corpus for alerts, and the manic is just a part of the grineer. As the first line in this tactics section says, "the Manic will only spawn if the level's alarm is raised, and will announce its presence with loud, howling laughter."