On my first playthrough I ended up skipping last light entirely by accident. After doin the crypt a bunch of people I've never seen storm the towers.
I decide to ally myself with them, and do the fight. Afterwards I want to explore more of the second floor but it's counted as trespassing by the Harpers???
Like, excuse me ma'am, I just took away Ketheric Thorm's immortality, and fought alongside you against the Absolute in the tower, AND you just entrusted the fight with their leader to me.
Figuring that this random lady isn't going to tell me where I am, and am not allowed to go after I just saved her ass, I murder the remaining harpers and loot the tower at my leisure.
Probably the most odd and immersion breaking interaction I had in my playthrough.