Mysterium is a yearly gathering of fans of Cyan’s Myst series. It’s billed as a convention, but it’s more like a family gathering, where friends from all over the world come to hang out with each other. There has been a Mysterium every year since 2000, the largest one being in 2000 with 200 attendees. Mysterium generally attracts between 30-130 attendees, depending on location. Mysterium is financially supported by donations, merchandise proceeds and registration fees.