The Wizard is gone, and we books have awoken,
We better get to work before everything is broken
From the introduction:
Niches & Nonsense is a series of mini-hacks compatible with Dungeons & Dragons 5th Edition. You’ll need the Player’s Handbook and the Monster Manual to run it. You’ll also need the regular set of polyhedral dice, some pencils and paper, and approximately 5 people to play (give or take).