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Young Shadow Mimic

medium monstrosity (shapechanger), neutral evil
Young Shadow Mimic
Illustration: ChatGPT
Armor Class: 15 (natural armor)
Hit Points: 68 ()
Speed: 30 ft., climb 30 ft.
ModSave
STR16+3+3
DEX16+3+3
CON18+4+4
ModSave
INT11+0+0
WIS13+1+1
CHA16+3+3
Skills: Deception +7, Insight +3, Perception +3, Stealth +7
Damage Resistances: necrotic
Immunities: prone
Senses: darkvision 60 ft., passive Perception 13
Languages: Common plus one other language
CR: 4 (1,100 XP); PB +2

Traits

Shape Thief: The mimic can use its action to polymorph into:
  • Any Tiny, Small, or Medium object it has seen
  • Any creature it has seen with a Challenge Rating of 4 or lower
Its statistics remain unchanged except for its size.
 The transformation includes realistic body heat, scent, breathing, pulse, and voice. A creature can identify flaws in the disguise only with a successful DC 18 Intelligence (Investigation) check after interacting with the mimic for at least 1 minute.
 The mimic reverts to its true form if it dies.
Adhesive Flesh: A creature grappled by the mimic is restrained. Escape DC 14.
Shadow Skulker: While in dim light or darkness, the mimic can take the Hide action as a bonus action.

Actions

Multiattack: The mimic makes two pseudopod attacks.
Pseudopod: Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 10 () bludgeoning damage plus 3 () psychic damage. The target is grappled (escape DC 14).
Bite: Melee Weapon Attack: +5 to hit, reach 5 ft., one grappled target. Hit: 14 () piercing damage plus 3 () psychic damage.
Maw Unfolding (Recharge 5–6): The mimic partially reveals its true anatomy.
 Each creature within 15 feet that can see the mimic must succeed on a DC 14 Wisdom saving throw or become frightened until the end of the mimic's next turn.

Notes

Young shadow mimics are newly formed predators still learning stability and identity. They often imitate simple roles: travelers, beggars, animals, servants, or injured wanderers. Their disguises are extraordinary, but prolonged interaction sometimes reveals subtle emotional emptiness or strangely delayed reactions.
Most people live their entire lives without ever encountering a shadow mimic.
 Most scholars believe they do not exist at all.
 That uncertainty is exactly what allows them to survive.
 Shadow mimics are among the rarest known shapechangers in the world. Unlike ordinary mimics, which imitate objects through instinct and predatory adaptation, shadow mimics possess uncanny intelligence and an almost supernatural understanding of behavior, language, and identity. They do not merely disguise themselves. They perform lives.
 A shadow mimic may spend years as a dockworker, a priest, a city official, or a wandering sellsword. Some establish families. Some accumulate wealth and influence. Some disappear after decades without anyone realizing they were never human at all.
 No reliable origin for the species exists. Arcane theorists argue they are creatures born from living darkness. Others believe they are failed experiments in illusion and fleshcraft. A few ancient texts describe them as parasites from a realm where identity itself is mutable.
 Whatever the truth, shadow mimics are not inherently mindless killers. Young specimens are driven primarily by hunger and instinct, often struggling to maintain stable identities for long. Older shadow mimics become frighteningly patient and psychologically sophisticated. Ancient specimens can manipulate entire communities without ever revealing themselves.
 Their disguises are nearly impossible to penetrate through mundane means. They breathe, bleed, sleep, eat, sweat, and age convincingly. Many do not even maintain a “default” identity anymore. After centuries of stolen memories and borrowed lives, some elder shadow mimics no longer remember what they originally were.
 A city could host a shadow mimic for fifty years without incident.
 Then one day, someone vanishes.
 And suddenly a respected magistrate, beloved innkeeper, or trusted companion is gone forever, because they never truly existed to begin with.
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