Amorpheous. The ooze is able to squeeze through gaps as small as 1".

Voices of the Dead. The Ooze is able to take on the voices, memories, and shape of any humanoid it has consumed that had an intelligence score above 4.

Multi Attack.

Pseudopod. Melee Weapon Attack: +11 to hit, reach 15 ft., one creature. Hit: 22 (4d10) necrotic damage.

Rake of the Dead. The Ooze swings a massive hand of claws in a wide arc. Any creature within a 15' cube must make a DC 18 Dexterity saving throw.
Recharge 6

On a successful save, a creature takes half the slashing damage and is no necrotic damage. 

On a failed save, the creature takes 48 (4d12+5d8) slashing and necrotic damage. 

Bonus Actions

Shadowy Dart. The creature launches a mystical dart that buries itself in the shadow of its target, holding them in place. The creature must make a DC 18 Dexterity saving throw or be have their speed reduced to 0 and may not take reactions until the end of their next turn. Range 30'

Opportunity attack.

3 Legendary actions

Pseudopod Strike = 1

Shadowy Dart = 2