The Abomination (Mona Lisa's Revenge)

An alien organism which existed in a mineral used in paint by Guiseppe Di Cattivo in the fifteenth century. The painting was considered too terrifying to be seen. Once in close proximity to the Mona Lisa painting (painted with the same mineral paint), the Abomination and Mona Lisa came to life. However the painting was stored in a vault with a complex puzzle key required to open it; once Mona Lisa came to life she aimed to find this key to release the Abomination within.