Reincarnation of the Demon God to Unify the Nine Realms

He traveled through the Nine Realms Continent and became the son of the Demon King. However, because he was defeated by the Human Emperor in the Battle of the Holy Armor Valley, his cultivation was abolished by the Demon King. He was thrown into the Demonic Cave at the bottom of the Demon World and was exiled forever. No monster in the devil's cave would look directly at this deposed prince. He was regarded as an ant that could die at any time, like a fish in a knife, ready to be slaughtered. However, what they didn't know was that this ant, who was looked down upon by others, unexpectedly gained the mysterious power of signing. Defeat the low-level goblin and obtain the Demonic Fist Technique! Defeat the tauren and obtain the Great Harmony of Heavenly Demons! Defeat the giant lava snake and obtain the immortal magic armor! In the deepest part of the Demon Cave, a pair of eyes looked up at the sky. "When I break out of this demon world, it will be the day when the nine realms will be unified!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.