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Shredding ribbons
psion attack 5

area burst 1 within 10 squares

Target: each creature within the area of effect

Attack: Intelligence vs. Reflex

Hit: "2d6 + Intelligence modifier force damage."

Miss: "Half damage."

Effect: "The burst creates a zone that lasts until the end of your next turn. Any creature that enters the zone or starts its turn there takes force damage equal to your Wisdom modifier. A creature can take this damage only once per turn."

Sustain minor: "The zone persists."[PH3:85][U :12/2011]

Shredding ribbons is a daily power available to psions at 5th level.

The December 2011 update limited the damage dealt by zones created by a number of powers, including shredding ribbons, to once per creature per turn. This change was made to prevent characters from using forced movement in and out of a zone to deal large amounts of damage.