After talking for a while with Victoria, Dilan found out a few things that were of interest to him.
First of all, not all Vampires were leeches who would kill hapless humans just because they wanted. They could survive on the blood of animals as well. It would weaken their powers but for many, that wasn't a problem.
But with the Primordial Ascension, things had changed quite a bit. Vampires were targeted by many beasts, who wanted to become strong as quickly as possible.
If the Essence crystals of humans were considered a very nourishing treat, the Blood Essence of Vampires was comparable to an extravagant five-course meal.
That was why many Vampires began to quench their thirst with the blood of humans. Even those who had never gotten the taste of the blood of humans before the Primordial Ascension needed to be in their prime state. This was the reason they were forced to drink the blood of willing humans.