I, the Retired Emperor, Have Been Signing In at the Forbidden Grounds for Sixty Years

The author has already completed the million-word classics The Strongest Myriad Dao Fishing Emperor of the Heavens, Starting from Douluo: Invincible Throughout the Myriad Worlds, and Please Stop Talking! . Chu Qian transmigrates into the Supreme Emperor of the Great Chu Dynasty, whose lifespan is exhausted and whose breakthrough has failed. He thinks he is doomed once again, but unexpectedly activates the sign-in System. Signing in anywhere grants rewards. Sign in at the forbidden cave abode and receive a Nirvana Golden Elixir! Sign in at the imperial kitchen and receive the Heaven-Devouring Demonic Art! Sign in at the Golden Hall of the imperial palace and receive the Son of Heaven's God-Sealing Art! With the mindset that he will not emerge until he is invincible, Chu Qian hides in the imperial palace's forbidden grounds and signs in for sixty years! Sixty years later, when a million-strong alien cavalry charges into the imperial capital to slaughter countless civilians, Chu Qian, having refined the Ultimate Imperial Weapon, finally walks out of the imperial palace's forbidden grounds!