As you strike your foe, dull red energy spreads across it in the pattern of the rune of rust, a mark of the decay of all things.

Daily   ✦     Divine, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. Reflex

Hit: 3[W] + Strength modifier damage.

Miss: Half damage.

Effect: The target takes a -4 penalty to AC (save ends).

  Each Failed Saving Throw: The penalty increases by 2.

  Aftereffect: The penalty persists until the end of the target's next turn.

Published in Player's Handbook 3, page(s) 109.