Carrion Brute

 Immutable Form. The brute is immune to any spell or effect that would alter its form.

Magic Resistance. The brute has advantage on saving throws against spells and other magical effects.

Magic Weapons. The brute's weapon attacks are magical.

Flesh Warp. At the start of each of the brute's turns, roll a d6.
On a 1-2, the brute grows multiple additional eyes and has advantage on Perception checks and Dexterity saving throws.
On a 3-4, the brute gains another set of legs and increases its walking speed to 50 feet.
On a 5-6, the brute gains an additional limb and can make a slam attack as a bonus action.
These effects last until the end of the brute's turn.

Multiattack. The brute makes two slam attacks.

Slam. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 13 (2d8 + 4) bludgeoning damage. Instead of dealing damage, the brute can grapple the target (escape DC 17). While grappled in this way, the target is restrained

Subsume. Melee Weapon Attack: +8 to hit, reach 5 ft., one creature that is grappled by the brute. Hit: 27 (4d10+5) necrotic damage. The target's hit point maximum is reduced by an amount equal to half the damage taken, and the brute regains hit points equal to that amount. The reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.