bayhem image - Call of Warhammer: Beginning of The End Times mod for Medieval II: Total War: Kingdoms

I actually had an idea for having a misfire chance that would potentially blow siege engines up like on the tabletop, but it'd probably suck in practice.

Nah, the problem is on the tabletop there's a LOT of random failure stuff, basically the more destructive anything is, the more likely it is to backfire. Even almost the entire Greenskin army has to pass Animosity checks or they'll fight each other instead! It makes some factions a lot more random than others, like Greenskins and Skaven, but in the mod they already have some ways of showing that, like Skaven units friendly firing a lot. We can't do all the mechanics the same way as a turn based game, just like how TW:W doesn't try to with their magic having no dispell magic phase dueling.