From the Start, I Summoned Dr. Zombie to Speedrun the Xuanhuan World

Immortals dwell atop seas of clouds, while great demons lurk in the depths of the Hundred Thousand Mountains. Dynasties wage endless wars, and sects vie for supremacy. Ye Bai has no wish to rule as emperor. Seeking the Dao is what an immortal cultivator should do. But someone is forcing his hand. The world is cruel, and ghosts and monsters run rampant. There is only one choice: kill! “Doctor, tell me, why are immortals so weak?” “...” The Zombie Doctor said nothing as he looked at the countless zombie troops behind him. “General Yue, do you see where I'm pointing, toward the wilderness?” Yue Fei glanced over. A million troops stood in formation, their momentum surging toward the heavens.