Infernal Swarm

Infernal Swarm is a huge fiend (Challenge Rating 12).

Infernal Swarm — fantasy monster illustration. Infernal Swarm is a huge fiend (Challenge Rating 12).
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AC: 16

HP: 150

Speed: fly 40 ft., walk 25 ft., hover true

STR: 18

DEX: 16

CON: 13

INT: 8

WIS: 12

CHA: 19

A towering winged devil looms above, a wicked scimitar in its grasp. Its form shifts subtly, hinting at a deeper secret._
Infernal Insects. Infernal swarms are found throughout the Hells. Considered a delicacy, these insects can form a hive mind, which they use to shape their swarm into a massive winged devil whenever they are threatened. The individual insects are bat-winged and have bulging eyes, long spindly legs, and a carapace covered in poisonous barbs.
Hellish Poison. Infernal swarms feed on carrion, injecting the carcasses with a poison that liquifies tissue. This same poison coats their barbs, which painfully dissuades predators.
Sensitive to Sound. Loud noises disorient the insects and interrupt their coordination, temporarily scattering the individuals. However, it is rare to encounter these silent killers hunting on their own, and if one is spotted, there are certain to be many more to follow.

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Further reading

Jetpack7 Game Master Series
The Game Master's Book of Random Encounters
Jeff Ashworth · 2020
The Game Master's Book of Traps, Puzzles and Dungeons
Jeff Ashworth · 2022
The Game Master's Book of Legendary Dragons
Aaron Hübrich · 2022
Last updated 7/27/2026·Tags: monster, fiend, huge