This part is really boring for a warrior, so I just kill the zombies that are absolutely necessary.
As stated before, zombies are annoying so I try to avoid most of them. On the fight against the lich just keep hitting him as he's coming out of the crypt and he'll be half dead by the time he actually hits the ground. I also ran away after the lich fight because there are a crapload of ghouls that are just not worth fighting. And hopefully you saved your scrolls for the spiders fight, although the earthfire sword will more than suffice as well.