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Ray of enfeeblement
wizard attack 1

Target: one creature

Attack: Intelligence vs. Fortitude

Hit: "1d10 + Intelligence modifier necrotic damage, and the target is weakened until the end of your next turn."[PH:160]

Miss: "Half damage."[Dr401:54][U :12/2011]

Ray of enfeeblement is an encounter power available to wizards at 1st level.

The "Class Compendium: The Arcanist" article in Dragon 401 added the necromancy keyword and half damage on a miss to ray of enfeeblement. Previously, ray of enfeeblement had no effect on a miss. The December 2011 update finalized these changes.