Raise Dead + Vampirism

Good afternoon! Guys, please tell me about the interaction of these two spells. Let's say I raised a stack of Imps from the dead, and then cast Vampirism on them. After the battle, will only the number of Imps that were resurrected be taken away from me?

I think this example explains everything. I lost 135 Imps, then raised 8, then cast Vampirism, then "vampirized" them back to 135... when the last enemy fell... the battle ended, and 8 Imps were consumed. I think the logic is simple: "If the living were raised, then the raised ones are NO LONGER living, which means that at the end of the battle, the undead will die. Vampirism does not resurrect or raise HP, but rather restores... I think this can be called dark regeneration xD Regeneration also does not reduce HP, unlike resurrection.