Evolved Mimics typically begin to evolve around age of 100 years, if they be able to survived that long. They average life span is around 5 centuries old.

Evolved Mimics typically take the appearance of the humanoid race they like and as such take their appropriate sizes.

They have a climbing speed of 20 feet. Moving along ceilings counts as difficult terrain.

As the denizen of dungeon, you can speak, read, and write Common and Deep Speech.

As an action, your maw is a natural weapon, which you can use to make unarmed strikes. Dealing piercing damage equal to 1d8 + your Strength modifier plus 1d8 acid damage, and a creature that is hit by it will be grappled (DC 8 + prof. + Strength mod.)

As an action, you can polymorph into a Large or Tiny humanoid or inanimate object you have seen, or back into your true form. In object form, you are indistinguishable from an ordinary object while motionless, but you cannot benefit from equipment, cast spells, or speak. You can maintain concentration while in object form. You do not gain racial traits of any humanoid you mimic, and the imitation is always imperfect.

Starting at 3rd level. As a bonus action, you can transform some parts of your body into natural weapons dealing 1d6 + proficiency bonus damage of your choices (Bludgeoning, Piercing and Slashing) plus 1d8 acid damage.

As a reaction, while in object form. the mimic adheres to anything that touches it. A Large or smaller creature adhered to the mimic is also grappled by it and any escape attempts or DC saving throw equals 8 plus your Strength modifier and Proficiency Bonus. Ability checks made to escape this grapple have disadvantage.

Accustomed to life in dungeon, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

You are a Monstrosity.

You have advantage on attack rolls against any creature grappled by you.

Advantage on Charisma (Deception) checks and Dexterity (Stealth) checks made while motionless in object form.