Swarm of Prismatic Beetles — fantasy monster illustration. Swarm of Prismatic Beetles is a medium swarm (Challenge Rating 3).

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Swarm of Prismatic Beetles

Medium Swarm, Unaligned

AC
13
HP
60
Speed
30
CR
3

False


Armor Class 13

Hit Points 60 (11d8 + 11)

Speed 30 ft., burrow 20 ft., fly 5 ft.


STR
3 (-4)
DEX
16 (+3)
CON
12 (+1)
INT
1 (-5)
WIS
13 (+1)
CHA
2 (-4)

Skills Stealth +5, Perception +3

Damage Vulnerabilities False

Damage Resistances bludgeoning, piercing, slashing

Damage Immunities False

Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned

Senses blindsight 10 ft., darkvision 30 ft., passive Perception 13

Languages

Challenge 3


Traits

Glittering Carapace. When a creature that can see the swarm starts its turn within 30 feet of the swarm and the swarm is in bright or dim light, the swarm can force the creature to make a DC 13 Wisdom saving throw if the swarm isn't incapacitated and can see the creature. If the saving throw fails by 5 or more, the creature falls unconscious. Otherwise, a creature that fails the save is incapacitated and its speed is reduced to 0 until the start of its next turn, as it remains transfixed in place by the glitter of the swarm. A creature has advantage on the saving throw if the swarm is in dim light.

Swarm. The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Tiny insect. The swarm can't regain hp or gain temporary hp.

Actions

Bites. Melee Weapon Attack: +5 to hit, reach 0 ft., one creature in the swarm's space. Hit: 14 (4d6) piercing damage, or 7 (2d6) piercing damage if the swarm has half of its hp or fewer. The target must make a DC 13 Constitution saving throw. On a failure, a creature takes 10 (4d4) poison damage and is euphoric for 1 minute. On a success, a creature takes half the damage and isn't euphoric. A euphoric creature has disadvantage on saving throws. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Community Images

Swarm of Prismatic Beetles — fantasy monster illustrationPrimary
FTTHelper · auto-generated · monster · monster

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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