I had my first major incident, a sort of loyalty cascade or something, involving some undead.
The dwarf civ's queen, who by the way, is a human, and a necromancer, came to reside in my fort which thus became the mountainhome. Said necromancer queen's mood has been steadily declining for the few years she's been here. First her husband, also a necromancer, died early on, while hunting, by raising a long-dead troll as a "grim zombie", which then promptly mauled him.
We pretty much started work on the queen's royal accommodations as soon as she arrived, however, due to numerous setbacks, including careless cave-ins and phantom(
) aquifers, i've not even finished the throne room yet, two or so years after she arrived. Well, come late autumn of year 258, the 8th year of the fortress, the queen had enough and throws a tantrum and presumably punches something, starts a fight, probably raises some dead thing that i had laying around in the library, which then somehow spirals into the entire floor descending into a melee.
I can't even begin to comprehend what happened but when the fighting had died down, i myself was down to 121 dwarves from 152. among the dead were two of my superlegendary hammerdwarves and three fledgling speardwarves. Unfortunately, the human necromancer queen was not among the dead and had gained a title instead. Needless to say, i'm not terribly happy... And i still have to make her damn throne room now.