Tome

From publisher blurb:

Tome was written in the fall of 2018 as part of Inktober. Instead of drawings, I used Inktober's official list of prompts to write supplemental material for fantasy role-playing games over the course of October's 31 days, and inevitably bleeding into November for days I missed. The resulting material is largely system-agnostic, ready for you to drop into your campaign regardless of your chosen rule set or fantasy world.

In the pages of Tome you will find

Generators for various NPCs
World-building via short stories and in-world legends
Dice tables for magic and cursed items
Dungeon & landscape maps to explore