A model with the Mark of Khorne has the Frenzy special rule. In the case of models with the Cavalry, Monstrous Cavalry, Chariot or Monster unit type, only the rider has the Extra Attack special rule.
Source: Warhammer Fantasy: 8th Edition
A model with the Mark of Khorne has the Frenzy special rule. In the case of models with the Cavalry, Monstrous Cavalry, Chariot or Monster unit type, only the rider has the Extra Attack special rule.