It's Been 50 Years Since I Signed in to the Demon Locking Tower, and I Became the Peerless Demon King

Mu Chen traveled to a fantasy world, where thousands of races abounded, and gods and demons danced wildly. But unfortunately he became a little demon who was a novice in cultivation. What's even more unfortunate is that one of them is still being imprisoned in a place where there will never be daylight, such as the Demon Locking Tower. Faced with the thin spiritual energy that makes it difficult to practice, coupled with the oppression of upper-level demons, you may become the prey of a big demon at any time. But I didn't expect that at the most desperate moment, I would awaken the sign-in system and get amazing rewards just by signing in. Sign in on the first floor of the Demon Locking Tower and obtain the Demon King's original blood essence x 1 Sign in at the top of the Demon Locking Tower and obtain the Heart of the Demon God Sign in at Shushan and get the demon clan's artifact, the ninth-grade demon sword. Mu Chen quietly cultivated demons in the Demon Locking Tower, and made up his mind that he would never leave until he cultivated into a peerless demon and climbed to the top of the world~! But seeing that the people in Shushan were getting more and more excessive, their strength no longer allowed Mu Chen to keep a low profile... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.