[Marillion]

I havent played this lich yet but on Kangaxx one winning tactic is to summon a Wizard Eye.
The Demi Lich will try to imprison the eye, which is impossible.
And meanwhile until the eye are dispelled you can hack an slash best you will...
He wont bother you.

Not sure this works on this one but since it worked on Kangaxx i suppose it will here to.