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Fountain of flame
wizard attack 1

You weave a fiery pillar that spins like a top. With each revolution, it douses your enemies with searing heat.

area burst 1 within 10 squares

Target: each enemy within the burst

Attack: Intelligence vs. Reflex

Hit: 3d8 + Intelligence modifier fire damage.

Miss: Half damage.

Effect: The burst creates a zone that lasts until the end of the encounter. Any enemy that enters the zone or ends its turn there takes 5 fire damage. An enemy can take this damage only once per turn.

Fountain of flame is a 1st-level wizard daily attack power.

You unleash elemental fire as a searing fountain of flame—harmless to your allies but deadly to any foe that passes within. This mighty spell is best coordinated with forced movement or stunning attacks, hemming your enemies within the deadly maelstrom you create.[HotFL:207]

The December 2011 update limited the zone entry damage to once per turn.[U :12/2011]