Has anyone beaten the necromancer guy? He's tough. Maybe not as tough as Death usually is in Castlevania games, but he has a lot of life.
Yeap, I finally beat it after five or six tries.
The first part where it throws x lightnings at you is fairly even, just get a feeling for the time it takes between a crosshair to appear and when the lightning strikes, then you can hit it a few times while dodging them; if you also managed to stay near it (run underneath it during dodging) you can also hit it one or two times when it summons the zombies.
After it summons it battleaxe or something it becomes a lot harder; its lighting attack hits a lot quicker, the zombies are now really bothering and it's attack pattern becomes more random. If you run to the side when it appears you can jump, turn around midair and hit it once.
A general note about the zombies: Always attack the one to the side of the room first, the one closer to the necromancer will always first start to walk away from you.