From publisher blurb:
Like most people, you've probably asked yourself "How can I get my hands on more nightmarish supernatural evil?" Well look no further! Thirteen Shades of Darkness contains M&M Superlink stats and background information for thirteen occult supervillains, ranging in power from minor annoyances to dark and malignant gods.
Each of our thirteen villains offers a slightly different take on the genre; a shade of darkness all its own. They range in tone from lighthearted to unspeakable (and a few of them are both). Some are traditional supervillains whose powers derive from the occult--thieves, killers and murderous megalomaniacs who use the dark arts to pursue traditional supervillain goals, while some are much worse things.
Each comes with at least two adventure scenarios, for thirty adventures in total. All the blood-curdling horror you could possibly want, and perhaps just a little bit more!