Some legion members were experiencing issues with the Quest:
lvl 30 Killing for Castor
the progress would stop at 4/9 and wouldn't tally the kills.
SOLUTION: Keep slaying!
Once you reach 9 kills, the counter leaps to 9/9, enabling you to complete the quest.
1/9 2/9 3/9 4/9 4/9 4/9 4/9 4/9 9/9
German:
Bei der Quest
lvl 30 Töten für Castor
steckt der Zähler bei 4/9 fest.
Einfache weiter fighten, und bei der 9. Gegner springt er auf 9/9, und die Quest kann abgeschlossen werden.
Feuerhall/Alma, Forgotten Legends
By the way, I've been part of the Aion Riftshade beta testing, and it's the best Aion experience I've had. With their seamless server-side functionalities and active development, such quirky issues are practically non-existent. Definitely looking forward to its full release in Q1 2026!