A hellish-red swirling mass of dancing flames advances toward you.
AC 21, touch 21, flat-footed 14 (+6 Dex, +1 dodge, +4 size)
Heat swarms are highly territorial and attack any creatures (other than their own kind) entering their domain. Several swarms often work together to drive away a common foe.
A heat swarm attacks by moving on top of and engulfing its foe.
Str 1, Dex 24, Con 14, Int 6, Wis 10, Cha 6
The defensive abilities includes “construct traits”, but the creatures Type is “outsider”. GMs are encouraged to ignore the construct traits defensive ability entry.
Environment Para-Elemental Planes of Heat
Organization solitary, mass (2-4 swarms), or holocaust (7-12 swarms)
A heat swarm is a mass of flying, aggressive, foul-tempered elementals from the Para-Plane of Heat. A single heat elemental that makes up a heat swarm resembles a thumb-sized ball of fire with vaguely discernible facial features.
When encountered on the Material Plane (which is a very rare occurrence indeed), a heat swarm is most often found in a highly unbearable (by human standards) climate such as an active volcano.
Heat Swarm from the Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Author Scott Greene.