Lastly, being undead gives you a significant weakness to holy damage. So using liches in direct combat against mercurians isn't a good idea. And anyone running Order can bless their troops for a nasty sting against you. Also, Crown of Brilliance, already horribly powerful, is a Holy damage spell. It tears undead to pieces.On the subject of spells actually, there's also Destroy undead, whichyou become vulnerable to. Much more acessible, it can be used to attack you even while hidden deep within a stack.