Swarm of Clacker Beetles

Medium swarm of Tiny Beasts, unaligned

Armor Class 14 (natural armor)
Hit Points 36 (8d8)
Speed 20 ft., climb 20 ft.

3 (-4) 13 (+1) 10 (+0) 1 (-5) 7 (-2) 1 (-5)

Damage Resistances bludgeoning, piercing, slashing
Damage Immunities thunder
Condition Immunities charmed, frightened, paralyzed, petrified, prone, restrained, stunned
Senses blindsight 30 ft., passive Perception 8
Challenge 3 (700 XP)
Proficiency Bonus +2


  • Constant Clacking. A creature that starts its turn in the swarm’s space takes 5 (1d10) thunder damage.
  • 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 creature. The swarm can’t regain hit points or gain temporary hit points.


  • Bite. Melee Weapon Attack: +3 to hit, reach 0 ft., one target in the swarm’s space. Hit: 14 (4d6) piercing damage, or 7 (2d6) piercing damage if the swarm has half of its hit points or fewer. The golden beetle places its small mandible against its oversized mandible then snaps them quickly apart, creating a deafening clacking.


Clacker beetles are aggressive subterranean scavengers. Individually they aren’t much of a threat, but they’re rarely encountered individually. Worker clacker beetles and immature beetles form swarms, and soldiers always scavenge in groups.

Clacking Mandibles. The beetles get their name from the deadly clacking sound their mandibles produce. They can use their mandibles to create a clacking noise with the force of a sledgehammer. Clacker beetles use this attack to stun or kill potential prey. When they’re encountered in large groups, the rapid-fire clacking of their mandibles can quickly bring down creatures as large as trolls and ogres.

Cavern Nests. Clacker beetles nest by chewing holes into rock and rubble. A small cavern riddled with clacker beetle tunnels can house hundreds or thousands of the creatures. They’re fond of shiny objects, much as crows and pack rats are. When clacker beetles infest ancient tombs or other sites where valuables are stored, they’ve been known to snatch nearly all the gold, silver, and jewels and drag it to their nesting site.

Section 15: Copyright Notice

Tome of Beasts 3 © 2022 Open Design LLC; Authors: Eytan Bernstein, Celeste Conowitch, Benjamin L. Eastman, Robert Fairbanks, Scott Gable, Basheer Ghouse, Richard Green, Jeremy Hochhalter, Jeff Lee, Christopher Lockey, Sarah Madsen, Ben Mcfarland, Jonathan Miley, Kelly Pawlik, Sebastian Rombach, Chelsea Steverson, Brian Suskind, Mike Welham

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