A cage of blue fire springs from the ground around your enemies.

Encounter   ✦     Arcane, Fire, Implement
Standard Action      Area burst 2 within 20

Target: Each creature in the burst

Attack: Intelligence vs. AC, Wisdom vs. AC, or Charisma vs. AC

Hit: 2d10 + Intelligence, Wisdom, or Charisma modifier fire damage.

Effect: The burst creates an area of fire until the end of your next turn. A creature must spend an extra 3 squares of movement to go from a square in the area to one outside it. When a creature leaves the area, it takes 1d10 fire damage.

Published in Forgotten Realms Player's Guide, page(s) 44.