This item can be crafted using Jewelcrafting(370); .
Sometimes used by Tanking Paladins, and PvP Mages and Warlocks because of its high Stamina and Intelligence, and burst spell damage. It is also useful for mage tanking Krosh Firehand.
Effective Spell Power
Assuming this trinket were activated every cooldown, it would grant an effective:
150 * 20 / 300 = 150 * 1 / 15 = 150 / 15 = 10 Spell Power