lol... Yea so, there was this black widow leader I was planning on killing eventually, once I had some troops. It was near my starting point on single continent medium. Anyway, lo and behold it disappears about 10 turns in, and I never gave it a second thought. Figured it had been killed by something else or something. So I just go about my business. Finally head my party back to town after doing one of the 'lord is captured by bandits, bring him to your city' quests. Btw, I dislike how my party is split up when I hit town. Anyway I selected all of them , and moved them out of the city. Apparently the square I chose, had the invisible Black Widow, which killed each of my party members, one by one, and then froze the game, and crashed it.
debug.err:http://pastebin.ca/1897691
cheers,
p.s. have to admit Im loving this. I couldnt help smiling that an uber-invisible Black Widow not only cleared my party, but also took down the entire game.