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Ardent strike
paladin attack 1

Special: A character can use ardent strike instead of the melee basic attack or bull rush part of a charge action.

Target: one creature

Attack: Strength or Charisma vs. AC

Hit: "1[W] + Strength or Charisma modifier damage, and the target is subject to your divine sanction until the end of your next turn.
"Level 21: 2[W] + Strength or Charisma modifier damage."[DP:83]

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