Some ideas: raiding, seiging, spell AI and more..

[Cheezeninja]

I should have been more specific, I meant the spell description implies damage is done to the units inside the castle, but I have never seen evidence of it. I am aware of the damage the spell does to the castle, but if the units inside the castle can repair better than your troops outside it becomes moot how much damage you do as the game first applies the crumble damage and then does the besieger/defender check. While it does have uses now, obviously, it would become alot more useful if it either 1) fully destroyed the castle, requiring a new one to be built, or 2) applied the damage AFTER the defender/besieger check so that if the walls were completely crumbled you would then be able to storm the castle. This is only personal preference on my part.