[Such a tradition was new to him, but then, there was so many fey to keep track of and his expertise was more on daemons - especially the ones that reside in Hades. There was a higher chance that his father knew about this much better, having spent more time elsewhere.]

...I'm surprised they don't attack larger places more often. If they want to cause the most chaos, do it somewhere where it matters.

[Let themselves known, let the people fear them. They wouldn't be that different from real daemons.]

They probably did it because they know Nightfall is coming.