User blog comment:Blood Reaper/Skyrim released a day early/@comment-4512760-20111104212908

The spell is actually an active effect for the "Ring of Hircine". For those that don't know, Ring of Hircine appears on The Elder Scrolls III: Bloodmoon (Morrowind), however it was called Hircine's ring in Bloodmoon. "If you put Hircine's ring on, you will turn into a werewolf for around six hours." That would mean that it's possible to transform yourself into a werewolf in Skyrim. Assuming that the Ring of Hircine and Hircine's Ring have the same effect (In the image were it shows the Ring of Hircine it also reads: Additional werewolf transformation)