Libram of Resilience

With some work you can turn in the Libram of Resilience to Mathredis Firestar to receive a Lesser Arcanum of Resilience, which will permanently add 20 fire resistance to a leg or head slot item.

Required Materials

 * 1x Libram of Resilience
 * 1x Black Diamond
 * 4x Crystal Spire
 * 1x Burning Essence (quest item)
 * 30 gold

Source
Drops off level 50 and above humanoids around Azeroth.