Shadowghast

A shadowghast is an undead assassin. Leaping out from the shadows and trailing tendrils of darkness, it closes in on its prey with nary a sound, then tears into a victim with its paralyzing claws and furious bite.

Shadowghast CR: 5 (1,800 xp)

Medium undead, chaotic evil

Armor Class: 15

Hit Points: 49 (9d8 + 9)

Speed:

STR

14 +2

DEX

20 +5

CON

12 +1

INT

12 +1

WIS

11 +0

CHA

8 -1

Skills: Perception +3, Stealth +8

Damage Resistances: necrotic

Damage Immunities: poison

Condition Immunities: charmed, exhaustion, poisoned

Senses: darkvision 60 ft., passive Perception 13

Languages: --

Challenge Rating: 5 (1,800 xp)

Stench. Any creature that starts its turn within 5 feet of the shadowghast must succeed on a DC 12 Constitution saving throw or be poisoned until the start of its next turn. On a successful saving throw, the creature is immune to this Stench for 24 hours.
Shadow Stealth. While in dim light or darkness, the shadowghast can take the Hide action as a bonus action.

Actions

Multiattack. The shadowghast makes two attacks: one with its bite and one with its claws.
Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one creature. Hit: 11 (2d8 + 2) slashing damage plus 5 (1d10) necrotic damage.
Claws. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage. If the target is a creature other than an undead, it must succeed on a DC 12 Constitution saving throw or be paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.