I don't know. I didn't understand when he explained. He said he was tired of living, and that his life was a mistake. He said his sister would make a better Chosen - but he shouldn't want her to be Chosen in the first place! Chosens are supposed to give up their lives to regenerate the world!

[Still so easy to forget that Mithos is Yggdrasill, and that he especially should know that.]