You call up broken, red-hot rubble from below the ground in a wide circle around you, creating a formidable obstacle.

Daily   ✦     Fire, Primal, Zone
Minor Action      Close burst 3

Effect: The burst creates a zone that lasts until the end of the encounter. The zone is difficult terrain for your enemies. Any enemy that ends its turn within the zone or that falls prone within the zone takes 1d10 fire damage.

Published in Dark Sun Campaign Setting, page(s) 49.