User blog comment:B214/Question and Answers/@comment-50.11.177.49-20130716075244/@comment-1359322-20130716080453

First, Devils are originally beings from the Underworld. The ones that fell from the Heavens are the Fallen Angels. Second, your right, Mephisto Pheles didn't joined the Great War because he disliked their method of doing things like engaging in conflict.