Invoker Utility 6Demand Justice
Whether an ally labors under a deadly effect or a foe seeks to escape the just end wrought by your magic, you tilt fate in your favor.
Immediate Interrupt Ranged 10
Trigger: A creature within 10 squares of you makes a saving throw
Target: The triggering creature
Effect: The target rerolls the saving throw and must use the new result.
Published in Player's Handbook 2, page(s) 106.