Fugitive Warrog.

Things are not guaranteed to be good for him even if Xigger agrees to help him and the demon god is amendable to a cooperation between the two of them. It will just be a repeat of his stay in the Iron Fur pack. He will be replacing Sauron with the demon god and working hard for the Vampires instead of the pack.

It is all because he doesn't have the qualifications to be treated as an equal by the demon god. At best, he will be a desperate and weak Warrog seeking favours. 

So he decided to get rid of everyone else and take the entire pie for himself. He did what would give him the strength to protect himself and only that. He knows that when you need to rely on someone for safety, then you are weak and your fate is not in your hands. He doesn't like to live under someone else's grace or thumb. 

"I am a fugitive now. It is best to escape." He said after taking one last look at the mess he has created.