Tarti:
In the Ruins of Agony you will find Carcass Bats and Vampires.
I think Vampires might have something to do with the curse. I've heard that you can gain a Secret Material if you defeat Carcass Bats and Vampires.
Find the Secret Material and give it to Guard Kallesin.
I don't want you to get lost on your way to the ruins so I'll send you right there.
Teleport