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They only awaken again their own soldiers. They cannot create new undead from their fallen enemies, but they do not need to, since their armies will always come back at their call, no matter how many times they have been destroyed.
It really wouldn't create the effect you hope. There is a limited number of layers available on the portraits, which do not make possible for mutation graphical effects to be cumulative, therefore, the traits need to be left separate.
No, but it depends on other things, for example: if you are independent and they are vassals of someone else or viceversa, the religion, the casus belli etc.
Yes, it's a problem with special units localisation, nothing we can do with it, but the NONE does give you vampire knights correctly if you raise the levies.
And, as GrandiSlayer says as well as any vampiric player could, they are certainly worth the cost.
You need to either be a Strigoi or a Strigany, so tecnically, it is possible if you play a Strigany woman turned Lahmian, if I remember correctly my code...
You can sacrifice prisoners through targetted decision.
The more prisoners sacrificed, the higher your necromantic level gets, but it will disappear shortly after, so you must do the sacrifices right before casting the spell.