Reddit reviews Dark Souls Remastered Collector's Edition Guide
We found 2 Reddit comments about Dark Souls Remastered Collector's Edition Guide. Here are the top ones, ranked by their Reddit score.
Yup: https://www.amazon.com/Dark-Souls-Remastered-Collectors-Guide/dp/3869930896/ref=sr_1_1
You can also preorder the entire trilogy guide: https://www.amazon.com/Souls-Trilogy-Compendium-Future-Press/dp/3869930918/ref=sr_1_2
Only written lore is found in game or originated from in game. I know that some of the Soulsborne games have a written guide which you can buy. These books could also discuss the game's lore.
https://www.amazon.com/gp/product/3869930896?ie=UTF8&camp=213733&creative=393177&creativeASIN=3869930896&linkCode=shr&tag=epi096-20&linkId=OW27YEBX3WFRICVX&s=books&qid=1523036469&sr=1-1&keywords=9783869930893
This link is to the book guide for Dark Souls Remastered which has lore written by Epicnamebro. But as I said the information you would find in these books is probably information you could find in the games.
If you want other sources of Dark Souls lore you can check out other youtube channels like The Ashen Hollow, Mitch L, Aegon of Astora. They posted some great Dark souls lore videos.