<Banished Dark Moon Quest - Final>
<Kill 1 the Dark Prince:>
From the desperate situation that is not able to be shifted if he didn't take any risk, Rex steeled himself to face the obstacle that lies in front of him. In an instant, he knows exactly what risk he needed to take, and that is to finish the blessing from the Countess of the Dark Luniric.
It's the only thing that he can think of right now to get out of this sticky situation.
The blessing given by the Countess of the Dark Luniric is the only thing he can rely on right now, one of the components to finish the blessing quest is to kill Zegrath who is the current Dark Prince. Even now Rex still can't believe that Zegrath turns out to be the other prince, the Dark Prince.
Zegrath becoming a Dark Prince is a terrifying coincidence if he thinks about it.