Don't Fear the Ripper

from the synopsis:
This scenario involves a string of ritualistic murders that lead the characters to a young Wicce who has been possessed by an ancient and vengeful spirit through a tainted Athamé (dagger used to direct mystic energies). She purchased the blade at a second-hand auction, unaware that the spirit within is beholden to the Mad God Leviathan, who seeks to widen the tear in reality that will allow the god to begin its conquest of our reality. Characters with psychic visions will be very useful in this scenario, as will characters with street contacts. Sample characters are provided at the end of the scenario, which is specifically written for these characters; however, with minor alterations it should work with any group of Mundanes, Gifted, and/or Lesser Gifted characters. Throughout, the main villain will make heavy use of the Gateway and Greater Illusion Invocations to achieve a number of unsettling effects, and even upset the laws of nature. The Chronicler should be well aware of these abilities and use them to whatever ends suit the story best.