I have discovered something in Undrentides Crypt Tower THIRD FLOOR, that you get 100 xp for entering each of the side rooms for a total of 1000 xp. I discovered this when i got to level up upon entering one of the rooms, later I checked it for the other rooms.
Also in the room with three pairs of thrones (one pair for good, one pair for neutral and one pair for evil) you will get some temporary ability increase if you sit in one of the thrones corresponding to your alignment.
I tried to submit it to the walk through, but did not get any answer. So now i post it here.
Edit:
Now this has been here fore some months. I'd like to know if someone has tried it and if it works
for more than me.