Meliyat

At the very top of the world lies the isolated, frozen island of Meliyat, the ice kingdom of the peri. The cliffs that surround the island are solid sheets of ice over a thousand feet high, and then the battlements of the Fortress of Meliyat rise for another thousand feet beyond that.

The only non-magical way to enter the Fortress is to first navigate through a harbor on the northern end of the island which is nearly choked with undersea mines, and then (after docking successfully) make your way up a winding, narrow passageway that is even more heavily trapped than the harbor. Of course, one also has to dodge the arrows, bolts, and magical spells of the peri guards…