Nine Heavens Suppression: The Protagonist Must Be Invincible

Transmigrated as Zhou Qiong, the last leader of the Netherworld Sect, he wakes up only to find the seven orthodox sects besieging his mountain. With his original body's cultivation ruined by madness and elders plotting a coup, the Ten Thousand Demons Disciple System awakens at his critical moment. Every disciple he recruits grants him supreme cultivation and legendary techniques, making his sect stronger as his students grow. Zhou Qiong eagerly gathers celestial monsters as disciples. Unbeknownst to him, disciples of the demonic sect soon spread across the three realms, numbering in the nonillion. When these nonillion demonic soldiers obey his command, all celestial immortals and Buddhas bow, leaving Zhou Qiong as the invincible ruler of the three realms.