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Portal Mimic




From a strain of mimics bent on imitating quirky dungeon features, the portal mimic lays in wait as a ‘secret door’ waiting to be found. It discovered over time that prey loves the poke around when they see even one stone out of place. While this gets the first catch in, its fellows tend to batter the mimic to get them free. To that end, the portal mimic developed the ability to general a faux-treasure-laden pocket dimension on the other side of its opening. In truth, this is a mystical extension of the monstrosity’s stomach, and the portal mimic is a glutton.

Portal Mimic

Medium monstrosity (shapechanger), neutral

Armor Class 12 (natural armor)

Hit Points 67 (9d8 + 27)

 Speed 15ft

Str 18 Dex 12 Con 16 Int 5 Wis 17 Cha 8

Skills Perception +5, Stealth +5

Damage Immunities acid

Condition Immunities prone

Sensesdarkvision 60 ft., passive Perception 15

Languages -

Challenge 4 (1,100 XP)

Shapechanger.

TThe portal mimic can use its action to polymorph into a 'secret' door (DC 13 to 'discover') or back into its true, amorphous form. Its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Acidic Alcove (Object Form Only).

When the portal mimic is fused to a wall, it creates an extradimensional space on the other side that resembles an unlit room. This extradimensional space measures 10x10 and is under the effect of the darkness spell. Its walls are plain stone and it always has a piece of illusionary treasure within (DC 13).


If a creature ends its turn within the extradimensional space, it takes 10 (3d6) acid damage. If the portal mimic dies or reverts to its true, amorphous form, any creatures within the extradimensional space appear in an unoccupied square within 30 feet.

Adhesive (Object Form Only).

The mimic adheres to anything that touches it. A Huge or smaller creature adhered to the mimic is also grappled by it (escape DC 14). Ability checks made to escape this grapple have disadvantage.

False Appearance (Object Form Only).

While the mimic remains motionless, it is indistinguishable from a 'secret door.'

Grappler.

The mimic has advantage on attack rolls against any creature grappled by it.

Innate Spellcasting (3/Day).

The portal mimic can innately cast Misty Step, requiring no material components. Its innate spellcasting ability is Wisdom.

Actions

Multiattack.

The portal mimic makes two pseudopod attacks

Pseudopod.

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) bludgeoning damage. If the mimic is in object form, the target is subjected to its Adhesive trait.

Bite.

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) piercing damage plus 9 (2d8) acid damage.
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