Tap into the destructive power of the Outer Planes, dealing 4d6 radiant damage to all creature in range. All creatures with less than 50 HP must make a successful DC 15 Constitution check or die immediately. If you have less than half of your maximum spell slots, half of those who died (round down, maximum of 2) rise as visible Poltergeists for 1 minute. You can use your action on subsequent turns to direct these Poltergeists.