Retribution looms for those beyond redemption.Template:TCG quote
Retribution Aura is an instant cast aura that surrounds the paladin. If an enemy hits the paladin or a party member that is within 30 yards of the paladin, the attacker will take Holy damage. Like a group version of [Thorns].
Retribution Aura is not affected by +spell damage.
[Aura Mastery] will extend the radius of all the Paladin's auras to 40 yards.
Tips & Tricks
Retribution Aura best suits tanks, as it is a permanent costless source of threat. As it works "on-hit", it is especially suitable for multi-mob scenarios, as they will hit a lot for (usually) little damage per hit. In this case, it synergizes well with [Holy Shield] and [Blessing of Sanctuary].
When there's only a single paladin in a 5-man group or the tanks group in raid, this aura is best for a group that can take a few hits. For the non-tanks group in raid, Devotion Aura is more useful.
Since there is no resistance to Holy damage, the paladin's enemies will always take full damage (unless they resist it by the base miss chance).
Damage is not increased if the attacker is under Judgement of the Crusader. However, it does benefit from a possible party [Sanctity Aura]. (The same restrictions apply for Blessing of Sanctuary.)
Related Equipment
The Protection-centric Tier 5 Paladin Armor Set, Crystalforge Armor has a 2-piece set bonus that increases all damage done by Retribution Aura by 15.
Wrath of the Lich King
This aura is set to undergo a major revamp in the upcoming expansion, intended to make it the main aura for RetributionPaladins. Talented, this spell will grant those under its effects 2% increased damage and 3% melee and spell haste. The reactive damage component will also receive benefits from spell damage. With the planned removal of [Sanctity Aura], and the buffs to [Devotion Aura] (Grants those under its effects 3% bonus to healing received), this aura will probably no longer be used by Protection Paladins, but Retribution Paladins, as the name would initially suggest.