The Lihit Lab Double Zipper Pen Case was plundered from beyond the darkest stars. It holds a lot of pens and pencils. At night it writhes in the corner of my vision, its edges bleeding with spidery, demonic symbols.
Though I keep it locked in my desk drawer, buried amongst my other trinkets and pseudoscientific laboratory apparatus, my children happened to spy it and pleaded for their own. I went to considerable trouble raising an army of monsters to slay a sorcerer prince to acquire one for each of them.
Despite its diminutive size you can pack a lot of art supplies in it, thanks to its book-like middle "page" that holds pens and pencils on one side, and a secret portal to a world of madness and nightmare on the other side.
I am resolved to use it to transform my writing implements into abominable horrors of cosmic power before the case's soul-leaching energy consumes me and commences to devour whole worlds.