A unicorn was a Celestial that resembled a Horse with a white coat, mane, and tail. However, it had a number of traits that distinguished it from a horse, including cloven hooves and a long ivory-colored horn that protruded from its forehead. They were typically found in the Upper Realms, though could be found on the Prime Material as well, where they were viewed as unique symbols of purity and goodness.
Unicorns attacked primarily by impaling foes on their horns, although they could also use their hooves as weapons; however, they only employed such tactics in defense of justice. While they typically traveled alone, they mated for life, and once mated would sometimes join a herd of other unicorns.
Unicorns were able to sense evil nearby and radiate an aura which protected them from most evil spells, poisons, and charms. A touch of the unicorn's horn could both heal wounds and cure poison. They also had the ability to teleport to nearby locations and magically shield other creatures from danger.