Aura of Ashes

When cast as a spell from the Ashen Staff, this aura emanates within 60 feet from you and your staff, enabling all creatures within to benefit from its effects.

Wildfire Healing. When within this aura, all fire based attacks heal affected entities, instead of taking damage. 

Aura Smoke. While this spell heals instead of taking fire damage, its usage creates heavy smoke. Any affected character within range must make a fortitude (constitution) saving throw (DC 15) or spend that round coughing. A character who chokes for 2 consecutive rounds takes 1d6 points of nonlethal damage.

Smoke obscures vision, giving concealment (20% miss chance) to characters within it.