Cosmic Whalefall by Stella Condrey

Across the humpbacked sky, across the uncountable crystal spheres each as infinite as the last, you will encounter those unlike you have ever seen before. Within cosmin whalefall are 36 more backgrounds for use with Troika! The Other WOrld's Favorite RPG. Angelic executioners, were-veterinarians, tube grown jesters, eel wizards, and much more are found within these pages.

All you need for this book are two six sided dice and the "Troika!" core rules, which you can find for free online.