The Librarian of the Infinite Tower

Elias Quinn, a quiet bookworm and part-time librarian, wakes up in a world pulled straight out of the books he's always loved. He finds himself trapped inside the Tower of Eternum, a mysterious labyrinth said to contain every world ever written - and the only way to escape is to climb to the top.
But unlike other challengers, Elias isn't a warrior. He's a reader.
And readers know every ending.

With knowledge of magic systems, monster weaknesses, and story tropes from a thousand novels - plus a mysterious ability called [Archive of All Worlds], which lets him "borrow" powers and skills from books he's read - Elias becomes an unstoppable force within the Tower.