[shovah]

When you notice a bane-venom charm in your territorys? Patrol like mad with your huge masses of slaves and flying demons. In any province (preferably low income) with 5000+ pop get 3 lvl 1 blood mages, give them all dousing rods, set tax to zero and make them all hunt. Very efficent blood hunting. F9 isnt a requirement but it is immensly powerful, try f9, b4, d4 (minor fear rocks+you get vampires) with a decent dominion (atleast 6) and try to get 1 growth (maybe heat 1, growth 1, sloth 2, order 2).