Since I can't explore the radiation filled caverns I decide to check out the abandoned palace, where one of the citizens had locked himself in awhile ago. Everyone is kind enough to tell me he was a necromancer, and given the number of caskets I had to climb just to get into the place there's no prizes in guessing what I found inside.
Undead burned corpses!
Turns out the necromancer just wanted answers on the Dwarves Law, and had turned to raising the dead to try get answers. Failing that, his journal suggested he was going to try use the "power source" at a higher floor. This proved to be foolish because a) there is a speech book from the people before Jarl Metellus' group just lying around and b) the power source was focused radiation, and the necromancer had killed himself.
The speech book is an interesting read. Apparently those people also knew of "the Dwarves Law", but since they never saw it in action the speaker concluded the only way to find out if it was a lie was to simply punch someone. For Science! Given the layout of the scorch marks, that triggered the end for them.
I knew all those ominous looking dwarven robots pretending to be statues are evil. Hrm, actually maybe not evil. More like: Just.