Heatwave, hot off the presses.

[KevinJ]

I haven't decided where this will go, but here it is.

Heatwave (C) [6]: This spell creates intense (160F, 71C) heat in a megahex. Missile and thrown weapon attacks into or through the area of effect are at -1/Hex due to the heat shimmer. Those moving through the area of effect take 1 hit per hex traveled, while those who remain stationary in the area of effect take 2 hits per turn. flamable items exposed to the high temperature may burst into flame, especially after more than 3 rounds of exposure (this is up to the GM).

Air or water at or above 160F can scald bare skin.