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An incendiary cloud spell creates a cloud of roiling smoke shot through with white-hot embers. The smoke obscures all sight, including darkvision, beyond 5 feet. A creature within 5 feet has concealment (attacks have a 20% miss chance). Creatures farther away have total concealment (50% miss chance, and the attacker can't use sight to locate the target). In addition, the white-hot embers within the cloud deal 6d6 points of fire damage to everything within the cloud on your turn each round. All targets can make Reflex saves each round to take half damage.
The smoke moves away from you at 10 feet per round. Figure out the smoke's new spread each round based on its new point of origin, which is 10 feet farther away from where you were when you cast the spell. By concentrating, you can make the cloud move as much as 60 feet each round. Any portion of the cloud that would extend beyond your maximum range dissipates harmlessly, reducing the remainder's spread thereafter.
A moderate wind (11+ mph) disperses the smoke in 4 rounds; a strong wind (21+ mph) disperses the smoke in 1 round. The spell can't be cast and does not function underwater.