Originally, the only way to get inside was by joining House Aurelian and serving it faithfully. However, even though the tower is not a mandatory location (it's one of the ways to find out something else), I dislike when games tell me that there is only one way of doing something, so we tweaked it, adding two more ways to acquire the "key" either by stealth (insane amount of different checks in text adventure mode - only a master thief can pull it off) or combat (that's a purely hypothetical option because no dude is THAT bad).​