Incendiary Cloud

An incendiary cloud spell exactly resembles the smoke effects of a pyrotechnics spell, except that its minimum dimensions are a cloud of 10-foot height by 20-foot length and breadth. This dense vapor cloud billows forth, and on the third round of its existence it begins to flame, causing 1-2 points of damage per level of the wizard who cast it. On the fourth round it inflicts 1d4 points of damage per level of the caster, and on the fifth round this again drops to 1-2 points of damage per level as its flames burn out. Any successive rounds of existence are simply harmless smoke that obscures vision within its confines. Creatures within the cloud need to make only one saving throw if it is successful, but if they fail the first saving throw, they roll again on the fourth and fifth rounds (if necessary) to attempt to reduce damage sustained by one-half.

[Player's Handbook]

School: Alteration, Evocation
Level: 8
Rarity: Common

Range: 30 yards
Components: V, S, M
Duration: 4 rounds + 1d6 rounds
Casting Time: 2
Area of Effect: Special
Saving Throw: 1/2

Material Components: an available fire source, scrapings from beneath a dung pile, and a pinch of dust (all consumed)