Tremendous and inspirational resources for gamemasters! Dungeon Denizens 2 is a huge hardcover with 350+ monsters, How to Write Even Better Adventures has advice from experienced game designers, and there's even more!

The BX Advanced book is over 350 pages of player options and expansions for old school gaming, written for OSE and BX-style games in mind. New classes, spells, a simple skill system, and more.