Back at the Immortal Galaxy, it is thoroughly known that only trash level lineage vampires are obligated to drink blood.
Those who have even the slightest shred of the lineage of the three major noble clans, in other words, the Naktis, the Nosfear and the Silverheart families, aren't forced to drink blood to survive.
That being said, they instinctively have a desire to do so, either for pleasure or power, at least the vast majority, with the exception of those with high purity lineages, like Aisha.
Vampires hate being lumped in together with the undead who consume flesh of other rational humanoid beings, most of the cases, humans.
Because they think of themselves as superior nobility, while being proud of their above average looks, they disdain undead as ugly and savage beings.
