The Peerless Demon Disciple

Fate plays its tricks: The Demon-Subduing Command and the Immortal-Slaying Talisman, both personally forged by the Demon Emperor and the Immortal King and passed down as legacy treasures to cultivate disciples who would represent them in battle, have both ended up in the protagonist's hands. The Qimen devoured them both...

Spoiler for the later chapters: After converting the maids and reaching the Celestial Immortal Realm, one becomes worthy of leaving a mark on the Qimen, making it a place to entrust one's divine soul. Even if killed outside, one can be resurrected through that entrusted soul. The more maidservants there are, the more completely they return to their places; when they chant the scriptures, the power released by the treasures grows even more terrifying...