A total of 25 Rare Skill Evolution Books.
After synthesizing two Unique Skill Evolution Books and using 20 of them, there are 5 left.
This item seems to only be obtainable from the Gate of Immortality for now, and we have to wait until we enter the Thirty-Third World again.
Unable to wait that long, Zhang Yue directly used up these five Rare Skill Evolution Books!
Island Survival: I Became the Only Bodyguard on Death Island
Mature / Drama
Rebirth: I Turned Spider Man Into an Executioner
Sci-fi / Mature
LitRPG: My Unique Talent Is Fate Hints
LitRPG / Adventure
Global Stat Points: I Maxed Out Attack Speed
LitRPG / Urban
Myth Invasion: I Kill Gods on Earth
Urban / Comedy
After the World Became a Game I Chose Black Talent
LitRPG / Mature
LitRPG: I became the God of Mining
LitRPG / Xuanhuan
Global Panic: The Gnoll That Farmed the World
LitRPG / Urban
Endless Escape: I am the King of Vehicles
Harem / Sci-fi