An attack gets through, but before the attacker can withdraw, you smash your shield down upon it with crippling force.

Encounter   ✦     Martial
Immediate Interrupt      Melee 1

Requirement: You must be using a shield.

Trigger: An enemy adjacent to you hits you or an ally with a melee attack

Target: The triggering enemy

Attack: Strength + 3 vs. Fortitude
Level 11: Strength + 6 vs. Fortitude
Level 21: Strength + 9 vs. Fortitude

Hit: 1d10 damage, and the target is weakened until the end of your next turn.

Published in Dragon Magazine 385, page(s) 42.