A massive black horse wreathed in smoke and shadow, its hooves striking sparks as it moves. Its eyes burn like hot coals and its mane flickers like dark flame. It radiates an aura of dread that unsettles both riders and those nearby. Nightmares understand but cannot speak common and infernal.
Retnuh rides a nightmare named Buccephalus, given to him by Strahd von Zarovich on the road outside Barovia village. She is ash grey, her coat seeming to smoulder faintly at the edges, with a mane amber-bright and hot to the touch and eyes that burn a deep, steady orange. She moves with an unnatural, smooth grace, even on wet cobblestones.
Virro suspects she could be watching the party and reporting back to her old master. When he slapped her flank to drive her off, she reared and kicked him square in the chest, throwing him several feet and leaving him unconscious with his surcoat smouldering. Ireena Kolyana has since proposed using her as a channel to feed Strahd misinformation.