Heat Swarm

Large swarm of tiny elementals, unaligned

Armor Class 17 (natural armor)
Hit Points 152 (16d10 + 64)
Speed 30 ft., fly 40 ft. (hover)

STR	DEX	CON	INT	WIS	CHA
10 (+0)	20 (+5)	18 (+4)	4 (–3)	11 (+1)	11 (+1)

Skills Acrobatics +8, Stealth +7
Damage Resistances bludgeoning, piercing, slashing from nonmagical weapons
Damage Immunities fire, poison
Damage Vulnerabilities cold
Condition Immunities charmed, exhaustion, frightened, grappled, paralyzed, petrified, prone, restrained, stunned, unconscious
Senses darkvision 60 ft., passive Perception 11
Languages Ignan
Challenge 8 (2,900 XP)

SPECIAL TRAITS

• Fiery Aura. Creatures beginning their turn adjacent to the swarm must succeed on a DC 15 Dexterity saving throw or take 7 (2d6) fire damage.
• Swarm. The swarm can occupy another creature’s space and vice versa, and the swarm can move through any opening at least 2 inches square. The swarm can’t regain hit points or gain temporary hit points.

ACTIONS

• Slams. Melee Weapon Attack: +8 to hit, reach 0 ft., one creature in the swarm’s space. Hit: 28 (8d6) bludgeoning damage, or 14 (4d6) bludgeoning damage if the swarm has half of its hit points or fewer. The target must succeed on a DC 15 Constitution saving throw, taking 28 (8d6) fire damage on a failed save, or half as much damage on a successful one.

ABOUT

A heat swarm is a mass of flying, aggressive, foul-tempered elemental fire creatures. A single heat elemental that makes up a heat swarm resembles a thumb-sized ball of reddish flame 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 or on a solar surface.