Shadow Assassin Utility 12Bad Idea, Friend
The first time an enemy attacks you, that opponent discovers just how bad an idea that is.
Immediate Interrupt Personal
Trigger: An adjacent enemy makes a melee attack against you for the first time during this encounter, and you are not granting combat advantage.
Effect: You gain a +10 power bonus to all defenses against the enemy’s attack. If the attack misses, the enemy takes double your Shadow Assassin’s Riposte damage.
Updated in Class Compendium.
Published in Player's Handbook, page(s) 128, Class Compendium.