This is a free game that will allow DMs to create interesting dungeons with rich ecologies and histories.
“Gamemaster and Writer’s Guide to Creating Magic Schools” is a free ebook on Itch https://tyhulse.itch.io/creating-magic-schools. At over 100 pages it is an extensive guide to secret chambers, random encounters, and other enchanted fun.
I just posted my newest book “Monster Ecology” where I break down how magical creatures from Dragons to Owlbears might live and where they might live in a magical world.
This is good for those playing TTRPGs and writers who want to use it as inspiration in Worldbuilding.
There were about 20 free copies available.