In Indian mythology an Acheri is the ghost, or spirit, of a little girl who comes down from mountains and hilltops at night to bring sickness to humans, particularly children. As the Acheri wanders, if its shadow falls upon a child they will become terribly ill. The only defense against an Acheri was thought to be a red ribbon tied around one's neck.
Acheri appears as the boss of the bronze level of the Ueno Mirage instance. By defeating a wave of smaller versions of her, a boss version will appear. She is unique in being the first mob in Imagine capable of inflicting the Blindness ailment.
"A ghost of a little girl in Indian lore. She brings sickness to children. She comes down from the mountains at night and spreads disease by casting her shadow over children. A red ribbon tied around the neck protects children from her."