In your save before defeating Amdusias, try leaving Maxos temple and heading to the fjords (from the path to the far south west in Broken Valley). After that, return and see if forcing the game to reload the area makes a difference after meeting Damian. The teleporter is disabled until you defeat the 2 summoned Black Ring members, which doesn't happen in your case since they are not being triggered for some reason.
Try emailing support@larian.com, with a description of the problem and maybe a link to this topic. See the appropriate support page for
DKS or
FoV.
Perhaps include a save after defeating Amdusias but before the meeting with Damian.
BTW, your first encounter on Sentinel Island you can mindread to go up a level, so the higher level you are (I made it to level 22 in the fjords) the more of an experience bonus that will be. You don't need to get to a high level, but it would be better if you got to a new level before entering, to get a full level bonus.
In XP the saves are in the folder
C:\Documents and Settings\ %username% \Local Settings\Application Data\Divinity 2\Savegames
or in Vista / Win 7
C:\Users\ %username% \AppData\Local\Divinity 2\Savegames
You may need to set Windows Explorer to show hidden files and folders (
XP, Vista,
Win 7).
