Black unicorn

Black unicorns were unicorns who had been corrupted with the blood of demons and other fiends. They were known to live in Thay.

Description
Black unicorns had coal-black fur and silky manes. Their eyes could be glossy black or burning red. Their distinctive spiraled horns were long and chased with silver. Unlike normal unicorns, they had the sharp teeth of a carnivore.

Behavior
Black unicorns were crazed, hateful creatures that lived for violence. They delighted in causing pain and suffering, and preferred to eat their meals alive.

Abilities
Black unicorns, like their more peaceful kin, had multiple magical abilities. Like all unicorns, they could not be magically charmed or held, and were immune to poison and to death spells. They continually radiated silence in a radius around them. Three times per day, they could turn invisible, or radiate darkness for around them. Additionally, if they successfully attacked an opponent with their horn, they could inflict light wounds up to three times each day. Once per day, they could teleport themself and their rider without risk, but could only teleport while in darkness or shadow.

Black unicorns were highly intelligent and could learn to speak Common. Because of this, it was rumored that Thayan wizards were trying to teach them to cast spells with only verbal components.

Additionally, black unicorns could see up to in complete and even magical darkness. However, they disliked light.

The horn of a black unicorn was poisonous; anyone struck by it risked being paralyzed for as long as three days before dying of heart failure. The horn could be used to make an extremely potent and fast-acting poison that could kill or paralyze the victim.

Ecology
Black unicorns were normally solitary, but could also be found in small family units. They were unnatural carnivores that preferred to live in forests or plains. They were not territorial and wandered from place to place, often invisibly.

Black unicorns were created by wizards in Thay, where they were kept as pets and as mounts in elite cavalry units. However, black unicorns would allow themselves to be ridden by any drow or human female of evil alignment. They particularly enjoyed serving blackguards.