Before Damian left did he summon a couple henchmen? Defeating them is what activates the teleporter. Unfortunately, a couple people have run into a glitch where they don't get summoned.
If you have a recent save before encountering Damian you can try reloading and see if it helps (probably won't).
If you are playing DKS, you can email the save to support@larian.com, so they can enable the teleporter.
If you have D2:DC you can load the save in the Developer Mode version of the game, hit F11 to bring up the cheat window, and teleport to where you would have ended up (use the 'goto' coordinates X = 130, Y = -152, Z = -25).
BTW, your first encounter in that new location you can mindread to go up a level, so the higher level you are (I made it to 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 (equip anything you have with a Wisdom boost).
