I think adding some mechanic could spice up the dungeon, instead of giving all enemies immunity (taking away mechanics) I would suggest adding one like for example placing a crystal in certain rooms that give enemies in that room immunity (to mind effecting or KD) until broken, also maybe adding key locked doors to prevent skipping sections, like for example the key in the commode in the Ghastrian church ruins, this is a good design IMHO, a little back tracking (not too much). Just my two cents as I found the play a little boring in the Blackwatch dungeon but the atmosphere very cool. Also perhaps adding something to the underwater portion, a small rest safe hidden room or some such thing to make it worth going that route.