Save here: https://dl.dropbox.com/u/10090435/endgame.EleSav
I believe the crash is very similar to this one: https://forums.elementalgame.com/433772
Two out of three times I got a CTD in the middle of this battle, right when one of the enemies was going to move. Notes: there are tons of units here--many recuperating champions, a couple troops, and city defenders. The hitpoints are all wacked out due to a bug I reported earlier: https://forums.elementalgame.com/433769. My theory is that the CTD occurs when a zero or negative total HP unit comes up, though I don't think this always causes it. When I played through the battle and eliminated all of those units before they could move, I got no CTD.
Also, the catapult needs to be fixed. (cf https://forums.elementalgame.com/433513) Using the catapult's regular attack causes a weird animation and no damage is done, but the special attack seems to work. Also, what does the catapult's "siege" thingy do?