I was playing .34 with patch d as Calabim and had the game crash after killing Hyborem. I reloaded from a recent save and tried again, and the same thing happened. The third time, I saved right before the destroying turn, but did not have the game crash. For the first two times, I did the following on that turn:
-attacked w/catapult
-summoned a specter(w/vamp) in the town to the north (Straatos) and had it attack Dis
-summoned 4 specters(w/vamps) in the stack, had them all attack
-Cast Blur & Haste (w/adepts) on the stack
-Attacked until Dis was destroyed.
After that I finished off the turn with some feasting, and ended the turn. the game crashed before the next turn began.
...Oops, accidentally saved over the one from right before the attack. This autosave is from a few turns before. As far as the combat is concerned, I just waited around for the catapult to heal.