Target: one creature
Attack: Intelligence vs. Reflex
Hit: "1d6 + Intelligence modifier fire damage."
Effect: "Choose a square in the target's space. That square becomes a zone that lasts until the end of your next turn. Any creature that enters the zone, starts its turn there, or starts its turn adjacent to it takes fire damage equal to your Wisdom modifier. "
Target: each creature within the area of effect
Hit: "2d6 + Intelligence modifier fire damage."
The December 2011 update limited the damage dealt by zones created by a number of powers, including burning flux, 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.