Oh wow. You actually interpreted it as an attack? I was talking about how you get the upgrades. You have to research the ones for humans, orcs, and night elves, but the undead have the attack upgrade as an automatic. I know we're doing aura. We've established that. For the ability, why does it have to be just one building? if your main building is under attack, you're already screwed. taking out the casters' mana won't help you. No, if you have it on the towers, that would actually help more, meaning the player may want to put some towers near their main building, just to make sure it's safe.