Ring of Hircine

The Ring of Hircine will allow the wearer to transform into a werewolf an additional time per day.

This ring is only useful if you are already a werewolf if you are not a werewolf the ring is completely useless. The werewolf form is obtained through The Companions questline located in Whiterun.

How to obtain.
The Ring of Hircine is gained as a reward from the quest 'ILL MET BY THE MOON'. If the hero wishes to recieve the Ring of Hircine, he or she must decide against killing Sinding and kill the hunters that were sent by Hircine to kill Sinding. Upon leaving the cave, Dovakiin will be greeted by Hircine who will remove the curse from the ring.