Battle Guardian
Fighter Attack
Ignoring you in battle leaves a foe open to a devastating assault.
Personal
Trigger: An enemy subject to your defender aura either shifts or makes an attack that targets an ally of yours but not you or an ally who has an active defender aura.
Effect: You make a melee basic attack against the triggering enemy. If the attack misses. the enemy still takes damage equal to your Strength modifier.
Battle guardian is an at-will power granted to knights as a class feature at 1st level.