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.