Fantasy: There Is a Book of Mountains and Seas at the Beginning

Ye Yu was reborn and entered Fufeng Continent. When the system is activated, it turns out to be the "Classic of Mountains and Seas System" known in the previous life? Can you become stronger by absorbing the essence and blood of monsters? Bite! Absorb Jumang's essence and blood and get rewards: 'Nine Turns Divine Pill', 'Dao Baoding'! ' Ding! Absorb the essence and blood of Xuanwu and get rewards: Taoist methods 'Black Turtle Body Protection' and 'Tiandao Divine Armor'! Bite! Absorb the essence and blood of the phoenix and get rewards: the magical skill 'Resurrection' and 'Heavenly Spirit Medicine'! ..... Since then, Ye Yu has become a disaster for the demon clan. Demon King Realm? I suck! The realm of demon saint? I still suck! Suck it to the end, because everything is there! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.