You mean Unholy Light? I've always been afraid to use that as it 'Horror' marks you. But I do still have a steady stream of blood income, and now by searching the boards, I've discovered that you can have more then ONE blood mage in a province!
I'll just have to save up for the Arch Devil. Been using my good +7B mages for casting Imps and Storm Devils.
If the ArchDevil is properly equipped he'll easily survive any horror attacks from the horror mark. Plus his undead kills will catapult him into the hall of fame.
Example of good equipment:
Blue dragon armor for 75% cold resistance
--helps prevent ghosts from giving him fatigue
Boots of Quickness
--gives +3 defense
Main Gauche (Mage Bane if you got it)
--gives +6 defense
Any shield with high defense and encumberence 1 or less.
Amulet of Missile Protection
Amulet of Resielent(helps remove fatigue for more casting)