Western Fantasy: I Can Summon Nomad Emperors to Conquer All Races

【Slavery + Villain Protagonist + Races Vie for Supremacy + Summoning + Ruthless and Decisive】 Li Feng transmigrated to a Western fantasy world and became the chieftain of an eastern nomadic tribe driven to the desolate frontier. The Holy Empire branded him a barbarian, while the lords beyond the grasslands treated him like a pawn. A trap of a banquet nearly wiped out his entire army. Then the Nomadic Emperor System awakened. Genghis Khan, Heaven's Chosen: special unit, the Gray Wolf and White Deer Guards. Attila, the Scourge of God: special unit, the Heaven's Retribution Cavalry. Abaoji, the Sun of the Khitans: special unit, the Dragon-Emblazoned Ironwood Army. The cavalry of the human empire? The berserkers of the orc tribes? The elven forest's master archers? The dwarven castles' shield walls? The dragons' fiery breath? They would all be crushed beneath the Nomadic Emperor's advancing armies. Building a farming empire? Out of the question. The Calamity Tribe believes in one law alone. Plunder is the most efficient form of production. Revenge is the most basic form of dignity!