That is very strange, because in Lovis tower, before you meet Lovis, you need to answer the questions and one of questions about Dragon god and correct answer is - "Ouroboros, god of Dragons".
Also, if you read mind of Artemas, you will hear "Smile upon me favourably Ouroboros, god of Dragons, and upon Orobas, my kind master, now and in the afterlife".
Oh right, silly me. I just didn't play to much attention to the spelling :< Sorry.
Orobas was a DK, Ouroboros was the dragon. Thanks to Macbeth for pointing @ that.
MacbethTalana is now dead and Zandalor becomes your guide. From here on however, Ygerna sounds in your head, posing as Talana.
Still, there is a questions remains: HOW?
How she just possessed you? If she can so easy leave Hall of Echoes, why make all that complicated mess, there was much easier ways to do the things.
Also:
He says - for instance - that now Damian and Ygerna are invincible.
I dunno about Ygerna, it's just random make-up for Div2, but, if we accept the whole Divinity Universe (DD+BD+story_before_DD), then the Divine One was correct: Damian is the Lord of Chaos and he can't be killed/destroyed. he always come back. So far I haven't found any sane reason why Larian ruined the previous setting and changed almost everything in Div2 series.