It's called Monstrous Arcana and if I understand corectly it is basically a book full of scrolls of binding for new monsters to use in SoM games
Chief Educator of the Horsemen of Derailment "People demand freedom of speech to make up for the freedom of thought, which they avoid." SOREN KIERKEGAARD
My Night Goblin Shaman is running with the Siverjir's Hex Scroll (turns enemy wizards into toads) so the frogs are perfect!