Nega-Demon Serum
Description: a transparent vial filled with a golden-white fluid that glows in the darkness, yet casts no shadow. Don’t bother trying to analyze it, either. It’s not that the Nega-Demon Serum isn’t really there; it’s that, from the Serum’s hypothetical point of view, nothing in the physical universe really is.
Powers: Comprehensively destroying Evil schemes, plans, machinations, and eventually the evil entities involved with them, apparently.