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Coinswarm

Tiny Monstrosity, Neutral Evil


Armor Class 14 (natural armor)

Hit Points 63 (14d6+14)

Speed 20 ft.

STR 12 (+1)
DEX 14 (+2)
CON 14 (+2)
INT 6 (-2)
WIS 12 (+1)
CHA 4 (-3)

Saving Throws Dex +4

Skills Stealth +6, Perception +4

Damage Immunities poison

Condition Immunities charmed, frightened

Senses darkvision 60 ft., passive Perception 14

Languages

Challenge 4 (1,100 XP) Proficiency Bonus +2


Touch Bites. A creature that touches the swarm or enters its space triggers the coins to bite. The triggering creature takes 1d6 piercing damage from coin edges.
Keen Senses. The swarm has advantage on Wisdom (Perception) checks that rely on sight, hearing, or smell.
Swarm Form. The swarm is composed of many coins; it has advantage on Dexterity saving throws against effects that target a creature in a single space.

Actions

Multiattack. The swarm makes two Bite attacks.
Bite. Melee weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 9 (2d6+2) piercing damage. The sharp coin edges bite into flesh.
Coin Slash. Melee weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 5 (1d6+2) slashing damage. The swarm lashes out with a flurry of coins.

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Lore & Description

Appearance

A writhing, shimmering cloud of coins—copper, silver, and tarnished brass—coalesces into a moving mass. Each coin is sharp, like a tiny tooth, and the whole forms a densely packed sphere that ripples and shifts with will. It glints with reflected streetlight, and if you listen closely you hear the faint clink of countless coins brushing together as the swarm hunts for skin and breath.

Behavior & Origins

Born from a corrupted hoard and hungry for new pockets, the Coinswarm haunts places where money changes hands and greed thickens the air. It senses touch and movement, and the first contact with a creature often triggers a predatory bite that drains warmth as surely as it drains coin. Crowds dissipate when a swarm appears, and merchants speak in whispers of a metallic maw that gleans coins from careless fingers. Those who study it note that the swarm seems to multiply when treasure is nearby, as if greed itself feeds its form.

Monster Image

Coinswarm

Generation Info

Original prompt:
"A swarm of living coins that bite when touched."

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

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