Basically, if you find yourself at a wedding there, RUN.
Who did it? The books explain it, but honestly, I’ve forgotten. In the final analysis, it doesn’t really matter. Nothing good will come of it. Well, some good, maybe, but really a whole lot of horrible. It will just be horrible that we will tolerate because it’s being visited on (mostly) the right people.
We are steeped so far in blood that sin will pluck on sin.