The Legend of Outcasts

It's about a demon who is summoned to the world of Entailian and leads an 'activist/terrorist' group. After being imprisoned he's released so he can fight off a group of god like beings. To combat this he needs to rebuild the elite group of Outcasts and all while still being treated like a criminal. Why does he try to save this world? It's a fantasy universe setting with some more Modern day advancements with magical reasons thrown in.