Apparently, this is the first time that the sylladex has been shown on this comic. Allow me to explain in quick detail what this thing is. Every fetch modus on a person is attached to their sylladex, this thing. It contains each and every captchalogue cards on the person, and it is merely a thing to visualize the inventory. The Sylladex, to my understanding, doesn't actually exist in space, unlike it's constituents, so doesn't have much of a need to exist, it just shows which items you have.
Your sylladex has several cards in it that aren't filled, but the few are, are quite interesting: the book, your tablet, your eyes of newt, your imagination, candy corn, your coin purse, the pumpkin you had on earlier, and your glasses (not shown here). Most of your other items you leave inside of binder for future use.