Canticle

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

Multiattack. The Canticle can make two attacks on its turn, one to bite and the other to claw.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) necrotic damage. Target has to make a DC 10 Constitution saving throw to avoid being poisoned for 5 minutes.

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage.

Horrifying Visage. Each non-undead creature within 60 feet of the ghost that can see it must succeed on a DC 12 Wisdom saving throw or be frightened for 1 minute. If the save fails by 5 or more, the target also ages 1d4 × 5 years. 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 ghost'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.

Steam Breath (Recharge 6): The Canticle exhales a 15-foot cone of scalding steam. Each creature in that area must succeed on a DC 12 Dexterity saving throw, taking 4 (1d8) fire damage on a failed save, or half as much damage on a successful one.