Trappings of Invigoration is a medium armor set. When you fall below 25% Stamina, restore 11350 Stamina. This effect can occur once every 45 seconds.
A Magicka version of this set (Vestments of the Warlock) drops in Selene's Web.
The Trappings of Invigoration 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 medium armor, weapons and jewelry of this set in the Fang Lair (unique) motif style.