Accursed Spectre + 1

Incorporeal Movement. The spectre can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.

Regeneration. The spectre regains 5 hit points per turn if it has at least 1 hit point.

Accursed Fortitude. if damage reduces the spectre to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or a critical hit. On a success, the spectre drops to 1 hit point instead.

Freezing Body. A creature that touches the spectre or hits it with a melee attack takes 7 (2d6) cold damage.

Otherworldly Howl. The spectre emits a soul splitting howl. Each creature you choose within 60 feet must make a Constitution saving throw DC 15 or have the frightened condition for 1 round.

Multi Attack. The spectre makes two claw attacks. alternatively, it can make one claw attack and one life drain attack instead.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., 1 target. Hit: 12 (2d6 + 5) slashing damage plus 5 (2d4) necrotic damage.

Life Drain. Melee Spell Attack: +9 to hit, reach 5 ft., 1 target. Hit: 10 (3d6) necrotic damage. The target must succeed on a DC 15 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the creature finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.

Evil Eye. Ranged Spell Attack: range 60 ft., 1 target. Hit: 9 (2d4 + 4) Psychic damage,  attack rolls and Unarmed Strikes against it can score a Critical Hit on a roll of 19 or 20 on the d20.

Reality Bend. The spectre teleports up to 30 feet.

There's No Escape. When a hostile target enters within 5 feet of the spectre it can make one claw attack.