I Burn the Long Night with Imperial Bones

Lu Xuan enters the Great Emperor realm in an invincible state, but faces suspicion from the Immortal Family and the Undying Dao. Two emperors arrive to force him to guard the Heavenly Abyss. Ten thousand years later, as Lu Xuan's body is about to run out of energy, he hears a call from his clan. It turns out that during those ten thousand years, the Immortal Family failed to fulfill their promise, instead bullied and suppressed him, and now seek to seize the family's treasure, the Tai Xu Sword Canon.