If you come here before the demonic attack on the tavern, then you will meet the assassin Greybor here. You can attack enemies immediately, despite the fact that Irabet only asked for reconnaissance. If you decide not to attack or do not come here at all before the tavern attack, then most of the enemies will go to storm the tavern (and Greybor is behind them), and only a small part will remain in the Tower. For this location, there is no significant difference to come before or after the assault on the tavern. But if you come after the assault, there will be a funny dialogue) Well, or you can just read it below – sorry, I could not resist not to insert).
The ratio of ghosts at the entrance depends on the choice of an angel or demon at the Guardian-Stone. If you chose an angel, you will receive a buff (insignificant).
Inside you will stumble upon the cultist Tilmer – if you decide to attack him, he will try to eat a letter with information. You can either let him choke to death and then you will not know anything, or save him and get more or less a whole letter. From the letter you will learn the location of the cache of potions.