User blog comment:Khalael/Perpetuals/@comment-27657986-20160229015431/@comment-1620907-20160229122341

Even though Anval Thawn wasn't speculated at being the last Perpetual until The Ghost Halls, a book that wasn't published until September 2013. Until that time he was just a Grey Knight who wasn't linked to the Perpetual mythos. Or you know, I would have mentioned him being encountered as a Perpetual at the time of this blog.