Elder Shadow Mimic

huge monstrosity (shapechanger), lawful evil

Armor Class: 22 (natural armor)

Hit Points: 385 ()

Speed: 40 ft., climb 40 ft.

		Mod	Save
STR	28	+9	+16
DEX	20	+5	+12
CON	24	+7	+14

		Mod	Save
INT	22	+6	+6
WIS	20	+5	+12
CHA	26	+8	+15

Skills: Deception +22, Insight +12, Investigation +13, Perception +12, Persuasion +15, Stealth +12

Damage Resistances: cold, necrotic, psychic

Immunities: bludgeoning, piercing, and slashing from nonmagical attacks, charmed, frightened, prone

Senses: truesight 120 ft., darkvision 240 ft., passive Perception 22

Languages: all languages it has heard

CR: 22 (41,000 XP); PB +7

Traits

Perfect Existence: The mimic can use its action to polymorph into:

Any object Huge or smaller it has seen
Any creature it has seen with a Challenge Rating of 22 or lower

Its statistics remain unchanged except for its size.
The transformation is flawless. The mimic duplicates voice, scent, magical visual effects, injuries, habits, and subtle behavioral patterns. It may freely combine features from consumed identities.
Nonmagical means cannot reveal the disguise.
Even magic that reveals true forms shows unstable overlapping identities unless the viewer succeeds on a DC 22 Wisdom saving throw.
The mimic reverts to its true form if it dies.

Legendary Resistance (3/Day): If the mimic fails a saving throw, it can choose to succeed instead.

Impossible Anatomy: The mimic can move through spaces as narrow as 1 inch wide without squeezing.

Living Nightmare: A creature that starts its turn within 30 feet of the mimic while seeing its true form must succeed on a DC 22 Wisdom saving throw or become frightened until the start of its next turn.
If a creature fails this save by 5 or more, it is also stunned until the end of its current turn.

Endless Identities: The mimic cannot be surprised and has advantage on initiative rolls.
In addition, creatures have disadvantage on Wisdom (Insight) checks made against the mimic.

Actions

Multiattack: The mimic makes three attacks: one bite and two pseudopod attacks.

Pseudopod: Melee Weapon Attack: +16 to hit, reach 20 ft., one target. Hit: 25 () bludgeoning damage plus 13 () psychic damage. The target is grappled (escape DC 22).
A grappled creature is restrained and takes 10 () psychic damage at the start of each of its turns.

Bite: Melee Weapon Attack: +16 to hit, reach 10 ft., one grappled creature. Hit: 36 () piercing damage plus 18 () psychic damage.

Devour Persona (Recharge 5–6): One incapacitated creature within 5 feet must make a DC 22 Charisma saving throw.
On a failure:

The target takes 55 () psychic damage.
The mimic absorbs the target's memories, personality, speech patterns, and emotional responses.
The target has disadvantage on Wisdom and Charisma saving throws for 24 hours.

If this damage reduces the target to 0 hit points, the mimic permanently acquires the target's identity.

Identity Collapse (1/Day): The mimic reveals dozens of overlapping stolen identities simultaneously.
Each enemy within 60 feet that can see or hear the mimic must make a DC 22 Wisdom saving throw.
On a failure, a creature takes 45 () psychic damage and is confused for 1 minute. A creature can repeat the save at the end of each of its turns, ending the effect on itself on a success.
On a successful save, the creature takes half damage and suffers no other effect.

Legendary Actions

Shift: The mimic moves up to half its speed without provoking opportunity attacks.

Mimic Voice: The mimic perfectly imitates the voice of a trusted creature.
One creature within 60 feet that can hear the mimic must succeed on a DC 22 Wisdom saving throw or use its reaction to move up to its speed in a direction chosen by the mimic.

Pseudopod Attack (Costs 2 Actions): The mimic makes one pseudopod attack.

Tear Identity (Costs 3 Actions): One frightened creature within 60 feet must succeed on a DC 22 Charisma saving throw or take 27 () psychic damage and become stunned until the end of its next turn.

Notes

Elder shadow mimics are ancient apex infiltrators that have consumed countless identities over centuries. Entire bloodlines, institutions, and cities may unknowingly orbit around one. By the time an elder mimic is discovered, it is usually already too late.
Many elder shadow mimics no longer possess a stable identity at all. Their minds contain fractured remnants of hundreds of lives layered atop one another.

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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