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 Welcome to Night Vale Roleplaying Game is a campaign setting for the Essᴇɴᴄᴇ20 Rᴏʟᴇᴘʟᴀʏɪɴɢ Sʏsᴛᴇᴍ, based on the Welcome to Night Vale podcast.