Incendiary Veil (Stronghold Augmentation)

Incendiary Veil: This augmentation works like fog veil, except that a 10-foot-thick cloud of burning smoke extends out from the chosen side. Any creature in the smoke takes 4d6 points of fire damage every round. (Reflex save DC 22 halves.)
Caster Level: 15th; Prerequisites: Craft Wondrous Item, incendiary cloud; Market Price: 60,000 gp.