Ulfnor's Favor is a heavy armor set. The 5-piece set bonus increases the Magicka or Stamina your Heavy Attacks restore by 30%.
The Ulfnor's Favor set is part of the Dragon Bones DLC. It drops in Fang Lair in Bangkorai. Each set item is bound on pickup. You can acquire heavy armor, weapons and jewelry of this set in the Fang Lair (unique) motif style.