The Carnival of Mists

A strange meteorological phenomenon that some experience when traveling through The Sea of Blood. During the night, a thick mist descends on certain parts of the ocean, bringing with it visions of masked dancers. The presence of the dancers instills a sort of euphoria in some seamen, who begin to dance alongside the visions. Soon, however, the dancers' actions take a turn, and the seamen follow, brutally slaughtering each other until none are left.