Divinity 2 story would have worked if Damian knew about Ygerna's grand design, yet he turns out to be completely clueless - rendering the several parts where he shows up throughout the game to deliver an evil speech but failing to kill the main character, absurd.
Behrlihn was a terrible plot device, regardless whether the main character freed him or not.
And still no explanation how the Dragon Knight ended up in that stupid crystal.