There are 3 books in the World-Tree Trilogy series. The newest book is World-Tree's End which came out in 2019.

1
World-Tree Online

Book cover of World-Tree Online
In 2056, the world’s most powerful AI System, ARKUS, comes online. Created to extend human lifespans, it quickly makes world-changing discoveries in health science. It also develops an advanced VR headset that uses consumable nanomachines to let users experience time faster in virtual worlds.

Two years later, ARKUS releases World-Tree…
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2
Demon Lords

Book cover of Demon Lords
It’s been years since anyone has seen Noble Vincent, the player that brought down World-Tree Online’s tyrannical moderator. Even with a lifetime of perceived experiences in the game, he still has centuries to go before the update finally ends and the people trapped in the game are freed. After taking…

3
World-Tree's End

Book cover of World-Tree's End
Old Man Vincent is heading for the top of the World-Tree and beyond in the final installment of the World-Tree Trilogy. To get there, he's going to have to overcome titan-sized bosses, strange new worlds, an army of angels, and a seemingly invincible final boss. And yes, he's looking forward…