Brion was in the open space and looking at the the void of space. Before he start his journey he created a chair for himself in the space and then opened a book to read for himself. The book was simple and telling about the interesting facts about the human race. He knows that the things will be different if he were to think about that the matter of humans is not important. He want to be stronger and do whatever thing he wants but it does not mean that he would like to become a manifestation of a devil. It is just silly when thought from a perspective.
Brion read these books because in the end he did not wanted to forget where he have come from.
The Human Race has a good deal of reward systems. every one of them, every adept-level mage and even the weaker ones will gain some sort of a land and credit bonus for their effort.
İt is not just like "hey you all people are humans" "So fight for us just because we say so"