Altar of confinement
invoker utility 2
Effect: "You enter the altar of confinement stance. Until the stance ends, whenever you use a divine encounter or daily power, one enemy you can see that is not adjacent to any creature takes radiant damage equal to the higher of your Constitution or Intelligence modifiers."[Dr383:33]
Altar of confinement is a daily power available to invokers at 2nd level.
Altar of confinement was introduced in the "Invoker Essentials" article by Robert J. Schwalb in Dragon #383.