Do you know about a curse of the ancient civilization?

Quest Text I just reported my last patrol.

Summary Ah, I'm here because of the curse!
I wasn't taken to Daton Island by some pirates but was cursed.
Before I came here,
I heard several rumors of guards who have mysteriously disappeared on stormy nights!
I thought it was a rumor but then, it happened to me...
I lost consciousness and found myself on Daton Island when I woke up.
I knew instinctively that I've been cursed
and that I'll be suffering from nightmares every night!