I hate to leave a comment like this, but this DLC is not playable if you choose to go to the Vellum Citadel. The key items you need to progress are in an area that is only unlocked if you choose Lethian's Crossing over the Citadel. The game never communicates this, either before or after you make the choice. Not even the wikis are particularly clear. I saw confirmation on a Reddit post, of all places. The only reason I know it's not a bug is that the area that has the key items only opens as part of a quest that I can't do because I picked a different quest. Afgain, there is no warning or confirmation. This is a game that takes dozens of hours and now my playthrough can't even get through the content I recently bought. This is my second playthrough and it's not clear at all where to find the keys, let alone that I can't find them. There is no reason the player could not do both those quests or at least access both areas in one playthrough. I feel cheated. There's missable items, and then there is making your DLC unplayable if you pick the wrong arbitary quest line. The quests are not connected in any way, and I made this decision 10 hours ago. Why even have the DLC location pop up if I'm locked out of it by my choices? This feels cruel and it's baffling to me that such a good game could make such a hostile design decision. If anyone wants to tell me I'm wrong, that would be most appreciated. I was actually quite enjoying the story.