Magic Sites

[trebuchet]

There is no way to destroy magic sites currently in the game.

Off hand I would say that this would probably be somewhat of a thorny issue. To keep the game balanced you would have to take into account that some nations are more dependant on magic sites than others. Some would find such a spell to be crippling, others would barely be bothered by it - thus you'd have to tweak other things to restore some semblance of balance.