From the very beginning, Idan planned to stage a performance in which the Gatekeepers would appear in front of the audience. He wanted their appearance to be explained by the desire of an Ancient Vampire to enjoy the beauty and blood of beautiful women. This would explain why they appeared in front of the members of the Kingdom, and would not raise unnecessary questions.
The brutal killing of Arslan and the Beast only reinforced his legend as an Ancient Vampire.
Arabel in this story played the role of a madly in love and jealous dragoness. Which echoed her true nature a bit, and it was easy for her to play her role.
However, Idan hadn't considered the reaction of her vampire bloodline. He didn't expect that all these rumors about vampires preferring the blood of innocent girls would turn out to be true. His own bloodline encouraged him to drink and desecrate the bodies of Milena and Yulaya.
To desecrate their sanctity by turning them into blood — spawned vampires.
