Detect Life. The spirit can magically sense the presence of creatures up to 5 miles away that aren’t Undead or Constructs. It knows the general direction they’re in but not their exact locations.

Ethereal Sight. The spirit can see 60 feet into the Ethereal Plane when it is on the Material Plane, and vice versa.

Phase Walk. When the spirit takes the Dash action, it gains the effect of the blur spell until the beginning of its next turn.

Unusual Nature. The spirit doesn’t require air, food, drink, or sleep.

Multiattack. The spirit makes three Shattered Sword attacks. It also uses Horrifying Visage.

Shattered Sword. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 13 (3d6 + 3) slashing damage.

Etherealness. The spirit magically enters the Ethereal Plane from the Material Plane, or vice versa.

Horrifying Visage. Each non-Undead creature within 60 feet of the spirit that can see it must succeed on a DC 14 Wisdom saving throw or be frightened of it for 1 minute. If the save fails by 5 or more, the target also ages 1d4 × 10 years. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the spirit’s Horrifying Visage for the next 24 hours. The aging effect can be reversed with a greater restoration spell, but only within 24 hours of it occurring.

Haunting (Recharge 5–6). The spirit teleports up to 60 feet to an unoccupied space it can see. It then has advantage on the first melee attack it makes before the end of the turn.