Actions

Multiattack:

This creature can make 2 claw attacks.  

Claw:

10 ft., +9 to hit, 2d6 slashing damage and the target is grappled.  

Reaper's Bite (Apex):

5 ft., +9 to hit, 2d8 piercing damage and the target may make a DC 15 Wisdom saving throw. If the creature is frightened, it automatically fails this saving throw. On a failure, the creature cannot regain hit points until the end of the creature's next turn.

Bonus Actions

Shadowmeld:

The creature liquefies into a shadowy, tar-like substance. While in this form, the creature retains its movement, but cannot talk or make attacks. In addition, it can move through a space 1 inch wide without squeezing and is considered invisible while within darkness. The creature returns to its regular form at the end of its turn.

Ethereal Jaunt (Apex):

The creature can magically shift from the Material Plane to the Ethereal Plane, and vice versa.

Reactions

Fleshwarp:

When this creature takes damage from a magical attack or effect, it may gain resistance to this damage type until the end of its next turn.

Legendary Actions

Render Null:

The creature lets out a psyche-rending screech, causing anyone within 60 feet or within darkness who can hear the target to make a DC 15 Intelligence saving throw to take 2d6 Psychic damage and is frightened for 1 minute. The creature may repeat this save until the end of its next turn.

Tenebrous Metamorphosis:

  When this creature reaches half its maximum hit points, it may immediately move up to its full movement and take the Hide action as a free action, liquefying its exterior into a hardened, onyx shell. While in this state, it cannot move, take actions, and is considered behind 1/2 cover. It may also perform the Shadowmeld ability as a free action, but it cannot use Tenebrous Metamorphosis until the start of its next turn.