Hey Ownedcore,
as Mage you can Spellsteal this Buff from the Raremob Goda at the Isle of Thunder
Buff is: Kristallpanzer - Zauber - World of Warcraft
Rare mob: Goda - NPC - World of Warcraft
Buff gives u 10% Reduced Magic Damage for 45 Sec. and it Stacks up to 10 so you can get 100% reduced Damage.
Sorry if my English isnt perfekt.
Greets