From publisher blurb:
This installment of the Occult Skill Guide introduces over 40 pages of all-new Starfinder content designed to make size matter! Whether you want to keep the traditional starfarer’s flare and simply add some rules to make bigger opponents a bigger threat or whether you want to reduce your players to the size of ants, Sizechanging Rules has you covered! Included within this behemoth of a product are: size modifier rules for Starfinder characters, two new size categories (Supercolossal and Ultrafine), rules for translating Supercolossal creatures into starships for starship combat, new equipment (includes shrink guns, a size adjusting weapon fusion, size-adjusting armor, and more), 13 new spells, two new corruptions, three new occult rituals, and plenty of helpful tools and suggestions to make your sizechanging adventures the best they can be!