Board Thread:Oblivion/@comment-24516372-20141020121506/@comment-26007282-20150211200132

I think his sanity is what makes him insane. He's the only seemingly sane person in the Shivering Isles, and that's insane, thus, he's insane.

As for his apparent immortality... Who knows? Maybe be continues to live because dying would be expected -- the sane thing to do.