[Juzza]

Vampires are good because their immortal, if you get say 80 of them eventually you will have an experienced army of vampires, combine that with a spell like army of gold and you have flying, regenerating killing machines, that just come back if they die. However on their own vampires kinda suck, try combining them with other strategies.

Demon knights! oh they are awesome!! I'd go for, um LE Abisya with a god that can make the magic item "boots of earth" for 10 earth gems each, they increase earth magic by 1 and you need 2 earth and blood to cast demon knight? which means when some warlocks get earth magic you can just give them the boots, and when they start getting diseased take them away and give them to another one, cause they will get diseased.

Oooooh! also there is a pure blood spell that summons Demon knights, "Ritual of five gates" summons a Demon knight, A fiend of Darkness, a devil a Frost fiend and a Storm Demon/fiend/devil all at the hefty price of 28 blood slaves.