Karyk gave Aelric the impression that he had been convinced to join them only because of a promise of revenge. The reality might have been completely different, but it didn't matter at the moment.
Karyk followed Aelric back to the ship. This time, he didn't need to hide inside. As a proper guest, he was able to enter the ship much more openly, accompanying Aelric Drike.
The ship he entered was not the original one in which Aelric had been traveling. Instead, it was the warship that had been brought by his uncle.
Even though the Angels were dead, it was clear that the man was still cautious about his nephew's safety. As the only male heir of the Drike Family, Aelric's life held a lot of value to the family.
After Karyk entered the warship, he was truly able to grasp the nature of these ships from the inside. If he hadn't seen himself entering the ship, he would have been sure that he had been transported into an entirely different world.