The core rulebook for the Rocks on the Other Side RPG introduced you to a few beasts that you could use in your game. The Rocks on the Other Side Book of Beasts gives you nearly 70 beasts that you can use in your game.
This is a companion discussion topic for the original entry at https://rpg-trader.com/products/985/the-rocks-on-the-other-side-book-of-beasts