Fantasy: I Have Been Lying in a Coffin for Tens of Billions of Years!

Traveling through the fantasy world, others are either princes or saint sons of sects. Why did I travel through time and become a member of the ghost clan? And was sealed in a coffin for tens of billions of years? Hey hey hey, isn't there a mistake somewhere? Bite! The most powerful ghost system has been activated! Newbie gift package is opening... Obtain: Ghost King Qualification! Obtained: God Refining Dzogchen Cultivation! Obtain: God-level skills·Endless Ghost Realm! Obtain: God-level mind method·Ghost mind is clear! ... Zhou Yuan: Damn it? Is this a system? ! ! Zhou Yuan: It seems... My time travel is not bad, huh? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.