This Is Western Fantasy! Why Are You Giving Me Three Kingdoms Generals?

[Western Fantasy + Lord + Multiple Races + Farming + Slow Burn + Gacha Game + Crossover + Conquest] An Tao transmigrated into a Western fantasy world. But why did the System give him a Three Kingdoms generals gacha pool? Could Three Kingdoms generals really beat dragons? Oh! It's a high-martial-arts version of the Three Kingdoms. Never mind, then. From the start, he gets Dian Wei for a three-day trial, and saves the witch who took him in. But to get a permanent general, he has to pull from the gacha pool, with a guaranteed gold-tier pull within 90 draws. Good thing the first top-up of 648 gets him a permanent Dian Wei... One day. System customer service: "During the event, cumulative top-ups will earn you the limited general: God-Demon Lu Bu!" The ancient army that awoke from the abyssal trench was driven back by a kingdom of many races that had risen from nowhere. A powerful sea demon general was beheaded by a human warrior wielding a Green Dragon Crescent Blade...