Hollow Wraith

Medium undead, neutral evil

Armor Class:13
Hit Points:45 (6d8 + 18)
Speed:0 ft, fly 50 ft (hover)
Challenge:CR 3
STR
6 (-2)
DEX
16 (+3)
CON
16 (+3)
INT
12 (+1)
WIS
14 (+2)
CHA
15 (+2)
Damage Resistances:Acid, cold, fire, lightning, thunder; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities:Necrotic, poison
Condition Immunities:Charmed, exhaustion, grappled, paralyzed, petrified, poisoned, prone, restrained
Senses:Darkvision 60 ft, passive Perception 12

Actions

Life Drain. Melee spell attack: +5 to hit, reach 5 ft. Hit: 16 (3d8 + 3) necrotic damage. The target's HP maximum is reduced by the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this reduces its HP maximum to 0.
Wail (Recharge 5-6). Each non-undead creature within 30 feet must make a DC 13 WIS save or be frightened for 1 minute. A frightened creature can repeat the save at the end of each of its turns.