The Abomination (Mona Lisa's Revenge)

The Abomination was a creation and masterpiece of Giuseppe di Cattivo. He painted it with pigments derived from sentient rock that fell to Earth. The Abomination sent di Cattivo insane. He crafted the Chinese Puzzle Box to make sure no one ever saw it.

It was located underneath the International Gallery and recovered by its sister, Mona Lisa. It was shot and killed when K9 destroyed the painting's pigments, and subsequently, the living Abomination. It took on the form of a huge Demon. (SJA: Mona Lisa's Revenge)