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Righteous radiance
paladin attack

Trigger: an enemy affected by the user's defender aura shifts, or targets an ally of the user with an attack without also targeting the user or an ally of the user with a defender aura active

Target: the triggering enemy

Effect: "The target takes radiant damage equal to 3 + your Charisma modifier.

"Level 11: 6 + Charisma modifier radiant damage.

"Level 21: 9 + Charisma modifier radiant damage."[HotFK:125]

Righteous radiance is an at-will power granted to cavaliers as a class feature at 1st level.

Characters who take the Squire of Righteousness feat to multiclass as cavalier also gain righteous radiance, but as an encounter rather than at-will power.