The Secret is a shoebox-sized, ornately-lacquered blackthorn box that unleashes a cloud of green smoke when opened. It contains a set of scrolls for the spells “Mass Enlarge Person,” “Scrying,” and “Animate Dead.” It also contains an additional unnamed spell that makes the caster grow to mythic proportions.

The Secret was first found by Madam Mysteria's mother, but she died in the process of obtaining it. Its true purpose remained hidden until a scholar revealed its power to Madam Mysteria. She used the tome's magic to defeat Liminy Locust and restore Grasshopper City to its peaceful state as Purithra Guild.