The Flesh

Amphibious. Can breathe air and water.

Amorphous (True Form Only). Can move through a space as narrow as 1 inch wide with o squeezing.

Mimicry (Assumed Form Only). Can mimic the sounds and voice of its assumed form. A creature that hears these sounds can tell they are imitations with successful DC 14 Wis (Insight) check.

Regeneration. Regains 5 hp at the start of its turn. If it takes acid or fire this trait doesn't function at the start of its next turn. Dies only if it starts its turn with 0 hp and doesn't regenerate.

Multiattack. Two Slam attacks or two Manipulate Flesh attacks.

Slam. Melee Weapon Attack: +6 to hit, 5 ft., one target, 11 (2d6+4) bludgeoning damage.

Manipulate Flesh. Can choose one of these attack options:Manifold Bite: Melee Weapon Attack: +6 to hit, 5 ft., one target, 14 (4d4+4) piercing damage and the target can't regain hp until the start of the flesh's next turn.Tentacle Melee Weapon Attack: +6 to hit, 10 ft., one target, 11 (2d6+4) bludgeoning damage and target is grappled (escape DC 13). Until this grapple ends target is restrained. The flesh can have up to two tentacles each can grapple only one target.Acidic Mucus: Ranged Weapon Attack: +4 to hit, 60 ft., one target, 14 (4d6) acid and 7 (2d6) acid at start of its next turn unless target immediately uses reaction to wipe.

Assume Form. Consumes corpse of Med or smaller Humanoid or Beast within 5 ft. and transforms into it. Stats other than size are the same in new form. Any items worn/carried meld into new form. Can't activate use wield or otherwise benefit from any of its equipment. It reverts to its true aberrant form if it dies makes a Manipulate Flesh attack or uses Assume Form while transformed.