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The Sylladex is the inventory system in Stemfazed. All characters have a Sylladex to store and retrieve artifacts from, which consists of two decks of cards: the Captchalogue Deck and the Strife Deck. These cards have codes on their backs that can be entered on the Punch Designix to create a punched card. Propsitians and Dersites do not have a Sylladex, and so must just pick things up to use them. The word "Sylladex" is presumably a portmanteau of "syllabus" and "index"; its plural is "Sylladices".