Corrupted Violinist

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

Incorporeal Movement. The Corrupted Violinist 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.

Song of Undeath. Any creature which dies within 60 ft of the Corrupted Violinist are brought back as incorporeal undead with 1/2 the hit points they had in life under the control of the Corrupted Violinist. These undead otherwise use the statblock for a standard Ghost as detailed in the monster manual.

Withering Touch. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 17 (4d6 + 3) necrotic damage.

Etherealness. The corrupted Violinist enters the Ethereal Plane from the Material Plane, or vice versa. It is visible on the Material Plane while it is in the Border Ethereal, and vice versa, yet it can't affect or be affected by anything on the other plane.

Hauntingly Beautiful Song. Each non-undead creature within 60 feet of the Corrupted Violinist that can hear it must succeed on a DC 13 Wisdom saving throw or be frightened for 1 minute. If the save fails by 5 or more, the target also ages 1d4 × 10 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 Corrupted Violinist's Hauntingly Beautiful Song for the next 24 hours. The aging effect can be reversed with a greater restoration spell, but only within 24 hours of it occurring.