The quest name is "The ladle in the Darkness lv49" which is to kill the last boss as a soldier, however, any npcs don't provide the next quest which is, " Rock the Castrum " that ive heard. even fking NPC Minfila, where can I go and where do I have to do now, my lv is 50, and I am completely wasting of my times for 2 days.

Do I have to quit this game if this is a ciritical bug?

please help me