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Bolstering strike
paladin attack 1

Target: one creature

Attack: Charisma vs. AC

Hit: "1[W] + Charisma modifier damage, and you gain temporary hit points equal to your Wisdom modifier.
"Increase damage to 2[W] + Charisma modifier at 21st level."[PH:92]

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