BATTLE TOWER (this is going mostly off memory and other posts, PM me if any corrections are needed.
Uncommon Installation Bug: For some reason, sometimes the buttons will not appear on the elevator, or one is missing. If you cannot go up and down all these levels then try the following. Exit the battle tower and save your game. Reinstall the game, reapply the patch. Go back into the battle tower. There is an elevator at the end of the summoning room to get to the throne room. This is a rare problem.
Dungeon F-1 (Floor 1)
Search the walls in the cell that shows there should be a continuous hallway instead of a wall. Run up and down right clicking it. Make a right (if go strait will be in back room) and on the right side of that wall you'll actually see a small black switch on the wall.
In the cell with the smashed in door is the key to get into the Library.
Use the explosives to remove the rock. Rocks will fly threw the wall so give it plenty of room!
Elevator:
Morgue B-1
Talk to the npc. Nothing here other than a way point back into the Battle tower. Very useful to sell all the junk you find here. This is the only way to ever get back to this part of the game after murdering Laiken.
Library: F-2
Door locked? You missed the key!
Mindread the goblin. Find the book on the one book case. ZMOG! A locked box!

Check for other rooms that have the key.
Tortue Chamber. F-3
Find a body that will get up and start hitting you. Properly dispose of it and claim the key for the locked box in the Library. Return to the Library and open the small box.
Summoning Room. F-4
Two little fights here, they were pretty easy.
Laiken: F-5
Best to take out the demon. Laiken then turns into a bag of gold. YOu can leave the loot bags alone and continue, they'll reappear after all the blood, bones and teeth are cleaned up from the floor...
Access to other sections of battle tower:
Use the teleport stone found in quest tab.