Treasure Mimic Slime

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Medium Ooze (treasure mimic), Neutral Evil

Armor Class 12 (natural armor)

Hit Points 52 (8d8+16)

Speed 20 ft.

STR 16 (+3)

DEX 14 (+2)

CON 14 (+2)

INT 6 (-2)

WIS 12 (+1)

CHA 8 (-1)

Saving Throws Con +4

Skills Stealth +6, Perception +4

Damage Immunities poison

Condition Immunities poisoned

Senses darkvision 60 ft., passive Perception 14

Languages —

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

Treasure Mimicry. The slime can perfectly imitate treasure, taking the form of gems, coins, and jewelry. While in treasure form, it is indistinguishable from real treasure to the naked eye. Creatures that touch the treasure or attempt to pick it up automatically reveal the slime and provoke an attack. The slime can switch between treasure form and its ooze form as a bonus action on its turn.

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

Actions

Multiattack. The slime makes two Slam attacks.

Slam. Melee weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6+3) bludgeoning damage. The ooze's amorphous mass lashes out at a target.

Treasure Reveal. When a creature touches the treasure form, the slime bursts forth from the mimic form and engages in combat, ending the disguise. On its next turn it can use its Slam.

Environment Underdark

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Lore & Description

Appearance

A gleaming, ever-shifting blob of ooze that can mimic treasure: gold coins, glittering gems, and ornate jewelry. To the untrained eye, it sits among a hoard as if truly priceless. Its surface shimmers with mineral luster, and it exudes a faint metallic scent. When disturbed or touched, the treasure form dissolves into a living ooze, releasing a damp, rotten-coin odor as it surges to attack. In its true form, the slime is cooler to the touch than steel and can envelop intruders with sticky, crushing force.

Behavior & Origins

Treasure mimic slimes haunt ruins and cavern hoards, drawn by the scent of valuable metals and the thrill of ambush. They prefer to lie in wait as sparkling treasure until someone dares to claim it, at which point they reveal their true, hungry nature. They are patient and cunning, mimicking only as much as needed to tempt a target, then striking with the raw, shapeless appetite of ooze.

Generation Info

Original prompt:
"A slime that perfectly mimics treasure until touched."

Created: Feb 2, 2026
Modified: Jun 1, 2026