Armor of Faith

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Armor of Faith is a special buff that creates a shield around the buffed target which will absorb 500 damage and lasts 30 seconds. While the shield holds, spellcasting will not be interrupted by damage. The buff is created by priests wearing at least 3 pieces of the Tier 3 armor set called the Vestments of Faith. It is triggered when the priest casts a Greater Heal spell which critically heals.

Since the buff is random, you can't depend on it like you can depend on Power Word: Shield. However, the buff makes a nice bonus to the priest's formidable abilities.