King of the Wild Hunt
From Witcher Wiki
No enemy is more terrifying than the King of the Wild Hunt, who leads a horde of ghastly riders across the sky. Doom incarnate, he fears no opponent, for he can always decide that his adversary is doomed, which usually determines the outcome of any clash. Over the course of the game, Geralt will have several opportunities to meet the King of the Wild Hunt, as his every step is dogged by the specter.
