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Paige Matthews: "You look like you've been out to sea for quite some time"
Captain Black Jack Cutting: "Nearly three hundred years in a place beyond time and space. Only when the mystical fog rolls in do we get a chance to come and play in fair port cities like your own."
— Paige and the Captain dicussing the fog.[src]

The Mystical Fog is a supernatural fog of unknown origin that allowed Captain Black Jack Cutting and his cursed pirate crew to enter port cities, otherwise they were cursed to roam the seas for all eternity.