Thanx for the advice,I put a protection vs the undead and it worked perfectly,I come up to that Lich,and he doesn't even attack me hehe.So than I just gave him some hits and he died easily.Also I gained 55000 experience,that's the most I got so far for killing 1 enemy(2nd place is the unseeing eye which gave me 30000 experience).
Wohoo!