Incorporeal Movement. The Cursed Stalker 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.

Obsession. One creature that the Cursed Stalker can see within 60 feet of it must succeed on a DC14 Wisdom saving throw or become the obsession of the Cursed Stalker. Any illusions cast by the Cursed Stalker can target the obsession, becoming visible and more realistic to only them. Checks and saves made by the obsession to overcome such illusions are made at disadvantage. The Cursed Stalker can only have one obsession at a time. The target is immune to this Cursed Stalker's Obsession for 24 hours after succeeding on the saving throw or after the obsession ends.

Selective Visibility. The Cursed Stalker is always invisible unless its hunting. When the Cursed Stalker marks a creature as its obsession, it becomes visible to only the targeted creature.

Spellcasting. The Cursed Stalker casts one of the following spells, using Charisma as the spellcasting ability (DC 14) and requiring no material components:
At will: Minor Illusion, Major Image, Phantasmal Force
1/day: Silence, Hallucinatory Terrain

Multiattack. The Cursed Stalker can use its Horrifying Visage. It then makes one Bite attack and one Rend attack.

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 14 (2d10 + 3) cold damage, and the target’s speed is halved until the start of the Cursed Stalker’s next turn

Rend. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 3) necrotic damage.

Horrifying Visage. Each non-undead creature within 60 feet of the Cursed Stalker that can see it must succeed on a DC 14 Wisdom saving throw or be frightened for 1 minute. A frightened target can repeat the saving throw at the end of each of its turns, ending the frightened condition on itself on a success. If a target's saving throw is successful or the effect ends for it, the target is immune to this Cursed Stalker's Horrifying Visage for the next 24 hours.

Possession (Recharge 6). One creature that the Cursed Stalker can see within 5 feet of it must succeed on a DC 14 Charisma saving throw or be possessed by the Cursed Stalker; the Cursed Stalker then disappears, and the target is incapacitated and loses control of its body. The Cursed Stalker now controls the body but doesn't deprive the target of awareness. The Cursed Stalker can't be targeted by any attack, spell, or other effect, except ones that turn undead, and it retains its alignment, Intelligence, Wisdom, Charisma, and immunity to being charmed and frightened. It otherwise uses the possessed target's statistics, but doesn't gain access to the target's knowledge, class features, or proficiencies.

The possession lasts until the body drops to 0 hit points, the Cursed Stalker ends it as a bonus action, or the Cursed Stalker is turned or forced out by an effect like the Dispel Evil and Good spell. When the possession ends, the Cursed Stalker reappears in an unoccupied space within 5 feet of the body. The target is immune to this Cursed Stalker's Possession for 24 hours after succeeding on the saving throw or after the possession ends.