Renthans were first introduced in Three Against the Witch World
Appearance: Renthans look like unicorns. They have golden eyes, roan red body fur and a creamy underbody. They have creamy tails and creamy, brush-like manes with a single, backwards-curving, red horn.
Living Area(s): Escore, particularly the Valley of Green Silences
Life Span: The lifespan of Renthans is unmentioned.
Power: Renthan are capable of speaking telepathically with others. They seem to have other abilities as well, though to what extent they have Power beyond telepathy is not clearly defined.
Other: They will not wear bridles or saddles, though they will carry supplies in cases of dire need. The Warding of the Witch World suggests Renthans may be a created race.