User blog comment:Swampman/SPOILERS----- Arisen Timeline/Speculation/@comment-91.152.101.144-20120630000810

Well, I finally managed to get the final ending I missed, and it appears that if you kill yourself with the Godsbane before killing the prior seneschal, you become the dragon while the seneschal continues his/her duty. So Grigori is very likely a former Arisen, which would also explain his talk about how he remember the pain, I suppose. Though he has also likely fought other Arisen before you.