Engrave Chest - Shield Mastery

Engrave your chest or robe with the Shield Mastery rune: Each time you Block, you regenerate mana equal to 9% of your maximum mana and you gain Armor equal to 31% of your shield's armor value, stacking up to 6 times. You also always gain 11% increased chance to Block and 16% increased Block value. In addition, each time you use a Shock ability, you gain 5 Spell Damage for each point of your defense skill beyond 5. Lasts 15 sec.