Gouts of flame pulse from your orb and explode amid your enemies, setting the area alight and roasting them as they attempt to escape
Area burst 1 within 10 squares
Target: Each creature in burst
Attack: Intelligence vs. Reflex
Hit: 1d6 + Intelligence modifier force damage, and you knock the target prone.
Effect: The burst creatures a zone of licking flames that lasts until the end of your next turn. Each enemy that enters the zone or starts its turn there takes 2 fire damage. An enemy can take this damage only once per turn.
Orb of Imposition: You can extend the duration of this effect, even though it is not an at-will power. If you do so, the area expands to burst 3 and doesn't affect you or your allies.
Orbmaster's Incendiary Detonation is a first level wizard encounter attack power.