Actions

Touch of the Guilty.
Melee Attack: +5, Reach 5 ft., one target
Hit: 13 (3d6+3) necrotic damage
Etherealness. The Wail 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.
Horrifying Anguish. Each non-undead creature within 60 ft. of the Unending Wail 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 x 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 wail's Horrifying Anguish for the next 24 hours. The aging effect can be reversed with a greater restoration spell, but only within 24 hours of it occurring.
Confession 1/day. The wail releases a mournful admission of guilt. They can only do this if they are not in sunlight. The confession has no effect on constructs or undead. All other creatures within 30 feet of her than can hear her must make a DC 13 Constitution saving throw. On a failure, a creature drops to 0 hit points, the burden of the guilt too heavy to bear. On a success, a creature takes [[3d6]] psychic damage.