I own the hollow knight art book and it’s really pretty. If you like the art & aesthetic of the game, you’ll love the book.

Halo

Morrowind. Check out the reddit. Many fans have created real world representations of in-game books and art.

Destiny 100%. The grimoire collection books are awesome, and they keep making more.

The Art of The Last of Us
The Witcher 3: Wild Hunt - The Art Book
The Skyrim Library
Bloodborne Official Artworks

These are gems when it comes to artwork for me!

I would recommend the Guild Wars 2 art book, lot of beautiful stuff in that game!

Battletech has great books. For an intro, look up Tex Talks Battletech on YouTube for a fun intro to the universe

Zelda Breath Of The Wild and Tears Of The Kingdom. Also the Halo series

Fromsoft