Chitin Convergence

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Medium Monstrosity (shapechanger, swarm), Neutral Evil

Armor Class 15 (natural armor)

Hit Points 65 (10d8+20)

Speed 30 ft.

STR 14 (+2)

DEX 12 (+1)

CON 14 (+2)

INT 10 (+0)

WIS 12 (+1)

CHA 8 (-1)

Saving Throws Con +5, Wis +4

Skills Stealth +3, Perception +4

Damage Resistances bludgeoning from nonmagical attacks; piercing from nonmagical attacks; slashing from nonmagical attacks

Condition Immunities poisoned

Senses darkvision 60 ft., passive Perception 14

Languages Common

Challenge 5 (1,800 XP) Proficiency Bonus +3

Shapechanger. The beetle swarm can rearrange itself into a humanoid silhouette as a special action (3/day). In humanoid form, it uses a different set of melee attacks and can present a more imposing threat. Transformation takes a moment and lasts until the end of the next turn.

Keen Senses. The swarm has advantage on Wisdom (Perception) checks that rely on sight, hearing, or smell.

Actions

Multiattack (Swarm Form). The swarm makes two Bite attacks.

Bite. Melee weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 12 (2d8+3) piercing damage. The swarm gnaws with innumerable mandibles; each bite deals piercing damage.

Humanoid-Form Blade (Chitin Blade). Melee weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6+4) slashing damage. In humanoid form, the swarm wields sharpened chitin blades forged from its own carapace.

Environment Forest

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Lore & Description

Appearance

A shifting cloud of iridescent beetles roils and reassembles into a humanoid silhouette. The surface of the form gleams with mica-like plates, each limb a mosaic of carapace segments that click softly as it moves. When threatened, the swarm can dissolve into a loose, crawling swarm once more, slipping through cracks and floorboards with unsettling speed. The humanoid guise often wears tattered clothing or cloaks, serving as a convincing deception to lure travelers or intruders closer before the true mass erupts again.

Behavior & Origins

The Chitin Convergence is born of a haunted hive that learned to mimic flesh. In forests and ruins, it idles as a curious rider in a traveler’s guise, listening with countless tiny ears until it can strike. When its appetite is whetted, the beetle bodies realign into a humanoid frame, marching with a chilling grace as if guided by a single, invisible mind. Those who escape tell of a pale, chitinous silhouette that resembles a village guard or merchant, a haunting illusion that shatters once the swarm surges forward in a bolt of claws and mandibles.

Monster Image

Generation Info

Original prompt:
"A beetle swarm that arranges itself into humanoid shapes."

Created: Feb 2, 2026
Modified: May 22, 2026