Boccob's Rolling Cloud

Evocation [Electricity, Fire]
A shimmering 10-foot-tall cloud made of gold, red, violet, and blue energy inflicts 1d6 points of damage per level (maximum 10d6). The damage is one-quarter electricity, one-quarter fire, one-quarter negative energy, and one-quarter positive energy.
Range: Close (25 ft. + 5 ft./2 levels)
Clr 4, Sor 3, Wiz 3

From: Dragon #338