User blog comment:LaxusDreyar/Weisslogia/@comment-1776824-20130430195856/@comment-15382134-20130430200742

Maybe he has just gotten old. I think it's like a beard or a mustache for humans. It's 400 years after all. Even dragons can age.

Rogue said his dragon was ill. So maybe he was just too old. Even dragons can't live forever...