This explained why Dominique's expression was dark and gloomy. It turned out Serena was captured by the vampires.
The vampires had two goals. The first goal was to help the White Claw Pack to rescue Cedric, the Alpha. The second goal was to kidnap the werewolf queen, Serena.
The vampires believed that Serena was Dominique's weakness. They planned to use her to defeat and eliminate the Werewolf King. She would become their bait to lure the werewolf king.
"How did it happen?" Marceline asked them.
"She followed Kira, the former vampire king. He was here!" An elder informed Marceline.
Little did they know, someone pretended to be Kira, the former vampire king. A copycat. Some vampires had the ability to copy the image or faces of other people. An impostor.