Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Beta End game broken? [spoiler allerts]

If you really want to get into the room (you're not missing much) you can toss a teleporter stone through the door, or destroy the door (use a summon to avoid NPCs reacting to your vandalism, and make sure you are not seen entering the room; the NPCs there don't seem to look into the room, so you don't need to worry about not being able to close the door behind yourself to loot).