A little thing I noticed.

1. How is the castle appearing in the video is conclusive evidence that the castle belongs to the Black Mage?
2. Why does the Black Mage even needs a castle when he can easily conquer the entire Maple World?

I'm not claiming it as evidence. It was just an interesting observation I made.

Also villains need castles...And since they're trying to revive him, wouldn't you need a ritual of some sort and a physical location?