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Virtuous strike
paladin attack 1

Special: Virtuous strike counts as a melee basic attack.

Target: one creature

Attack: Charisma vs. AC

Hit: "1[W] + Charisma modifier radiant damage, and you gain a +2 bonus to saving throws until the start of your next turn.
"Level 21: 2[W] + Charisma modifier radiant damage."[DP:83]

Virtuous strike is an at-will power available to paladins at 1st level.