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Piercing smite
paladin attack 1

Target: one creature

Attack: Strength vs. Reflex

Hit: "2[W] + Strength modifier damage, and the target and a number of enemies adjacent to you equal to your Wisdom modifier are marked until the end of your next turn."[PH:92]

Piercing smite is an encounter power available to paladins at 1st level.

It appears to be an average power, but was once the best option in the Player's Handbook.[1]