Night hag

Night hags were incredibly evil creatures that lived in the Lower Planes. They were known for their mercilessness and ability to walk in the dreams of others. In the Fiendish planes, they were powerful creatures and the developers of the process that created altraloths, powerful unique yugoloths, but much more commonly known for being able to harvest larvae, which were used as currency in the Abyss, Blood Rift, and Nine Hells. They also had an affinity for nightmares.

Description
Night hags were about as tall as human women. They had ugly features and blue-violet skin covered with warts, blisters, and sores. Their eyes burned red with malevolence. Their hands ended in jet-black talons.

Combat
A night hag had an array of magical powers, and could transmit a disease called demon fever by biting a victim. Night hags were also able to torment individuals by invading their dreams, inserting fear and doubt into their minds night after night, until they expired. They did so by going into the Ethereal plane using a special item called a heartstone. If this process led the victim to perform evil deeds, it eventually transformed the victim into a larva unless some force capable of affecting ethereal beings put a stop to it.

Society
Like all hags, night hags reproduced by devouring human infants that they stole from their cradles or from their mothers' wombs. After one week they gave birth to a seemingly human girl, whom the hag sometimes even returned to the original human for foster care. On the girl's thirteenth birthday, she transformed into a hag with identical features to the original hag who spawned her.

Religion
Cegilune was the goddess of the hags.

History
Night hags were once native to the Feywild, but their extreme evil led to their exile to Hades, from where they spread throughout the Lower Planes.