One of three bandits in the game, Hurricane Castio hides out in the Northern Glaciers. He is a wanted criminal with a 3500G bounty on his head. He likes to use a house there as his hide away.
Hurricane Castio is considerably more formidable than his predecessors, and he's the only bandit who can cast magic. Given his high HP and how much his attacks hurt, it's prudent to gain high levels of combat skill and combat/magic attack before facing him. Unlike the previous bandits, he's not the strongest fighter in the area though..
Hurricane Castio is not always easy to catch. Even if you find a way to his hideout he isn't always there.
If you do encounter him, he'll pay you 500G to pretend you never saw him. You can either accept the offer or refuse. If you accept, your daughter's Sin will go up 50 points. If you refuse you must fight him.