"Vanvitelli, she finds out what I do. She calls me a ‘Kislevite bestiarii’. She says, ‘we canna make some good money.' I say sounds good. Tell you truth, you know I would do it for free. I got to fight in the House of Glory! One of the lizard creatures she brought from Southlands, much smaller than big ones, but dangerous. They call it a Horned One. Wicked teeth and, no surprise, sharp horns. Quick. Lethal. Normally, pack hunter. But no pack now, so good for Vasya, da? We do an exhibition bout. 'Northern skill versa Southlands fury!' Was good crowd. Tileans know how to cheer. Was great fight. She left me scar as memory of Great Coliseum, da? Pity I couldn't kill her."
- —Vasya Ghorshkov, Ostermark pit fighter[3a]

A Skink Chief riding a Horned One.
The Horned Ones are an extremely rare, virtually extinct and preternaturally swift subspecies of the reptilian Cold Ones,[1a] spawned in the same Spawning Pools and at the same time as those who will ride them into battle as Horned One Riders in the armies of the Lizardmen.[2a] They are native to the Southlands[3a] and Lustria.[1a]
Role[]

A Horned One used as a mount by the Lizardmen as rendered for Total War: Warhammer II.
The Horned Ones are very aggressive and territorial, and will tackle virtually any other beast or monster, regardless of its size. The Horned Ones are naturally adapted for fighting duels and have large horns and spiny crests growing out of their heads.[1a]

A Horned One used as a mount by the Lizardmen as rendered for Total War: Warhammer II.
Unlike other Cold Ones, Horned Ones are not easily manipulated to change their targets, as they are always enraged by the smell of other creatures invading their territory. A Horned One therefore behaves like a Cold One which has already tasted blood and is eager to fight. The bellowing of the Horned One infects other Cold Ones with the same aggression, steeling them against manipulation as well.[1b]
Canon Conflict[]
The Lizardmen's 5th Edition armybook states that Horned Ones are found exclusively within Lustria, however the recent Warhammer Fantasy Roleplay 4th Edition sourcebook The Imperial Zoo has stated that Horned Ones also inhabit the Southlands.