Three Crones

There are always three crones; for that you can thank Greek mythology and Shakespeare.

Orota the Umbral Twilight

Description: The hag of Dunfang Forest is foul beyond compare and incomparably corpulent. She stands over two meters tall and moves with surprising swiftness considering her morbid obesity. Orota's eyes glow yellow over her wide, tusked grin. Her skin is mottled grey, her hands rough and callused. Her thin, black hair is parted down the centre by a thick horn that sprouts from her forehead.
Wants: Dominion over the natural world. The destruction of beautiful things. 
Has: Forbidden Knowledge. 
Speciality: Hypnosis. Making eye contact with Orota would be unwise, as she can captivate any one person for as long as she holds their gaze. Only a strong-willed man or woman would be capable of resisting the hag's bewitching stare.
Weakness: Fundamental elements. Orota fears pure samples of elements from the elemental planes; a fire kindled from the caldera of Irchundakra, waters from the shore of the Everlake, a blade forged of metal from the Elemental Plane of Tungsten.

Hildegard the Fair

Description: The hag of Bragimor Forest is remarkably ugly. Her form is that of a pale, wrinkled, misshapen old woman with a warped leg and a hole in her face where her nose ought to be. Yellowed fangs protrude from her uneven overbite, and a shock of white hair curls up from her scalp like the horns of an ibex. Perhaps just as striking as her repulsive appearance are the black-feathered wings that sprout from her back, allowing her to glide over the woods like a vulture in search of weaklings and carrion. She walks with a cane and an uneven gait, and her breath smells of rotten meat.
Wants: Mind-strands from the temple of Risnas, god of forgotten dreams. More slaves.
Has: A considerable number of mind-controlled slaves, including an ogre named Kririg. A long memory.
Speciality: Riddles. Those who wish something from Hildegard are often posed a riddle; failing to solve the riddle usually results in Hildegard's curse overtaking the visitor and they become another slave toiling in her gardens.
Weakness: Flattery. Getting on Hildegard's good side is not difficult if one can ignore her hideous appearance, odious eating habits, and foetid breath. This might allow someone to get close enough to threaten the hag without her escaping or calling her slaves to intervene.

Egnun the Shade of Twilight

Description: The hag of Díegol Forest is just as ugly, twisted, and devious as her sisters. She is large, almost as large as Orota, but where Orota is fat Egnun is muscular. Her tiny black eyes stare out from behind a curtain of matted, charcoal-coloured hair that does nothing to conceal her hideousness. Where a human would have a nose, she has a wart-covered trunk long enough to reache her chin. Her mouth is filled with yellowed tusks, her arms and legs are covered in coarse black hairs, and her digits all feature cracked yellow claws.
Wants: The womb of a virgin, fresh and still warm.
Has: A large array of rare ingredients and magical reagents. A flock of crows that spy on those who enter her territory.
Speciality: Alchemy. Egnun has forgotten more potion recipes than most alchemists will ever learn. She knows how to make poisons from the most benign of ingredients, and where to find plants and mushrooms to make insidiously potent mixtures. Her lair is littered with candles rendered from human fat and mixed with hallucinogenic plants so that their fumes dizzy and disorient uninvited guests.
Weakness: The spider demon Gennubath, to whom she owes a debt she struggles to repay.

The hags eat only meat, preferably human and preferably very fresh. Egnun was the only one to cook her victims.

The hags also had the ability to spread their curse by taking a prisoner and corrupting them over time. This resulted in the victim becoming a violently unstable, cannibalistic creature of the night that would stalk isolated villages and farmsteads, intending to kidnap fresh meals for its mistress.

I used these hags to tie three fantasy campaigns together. The hags sought to make bargains with the PCs, each trying to find the means to contact her sisters and reuinite the triumvirate. The hags' bargains were always one-sided and laced with deception, and although the PCs were always very cautious around the crones they always made secret vows to one day return and kill the hag they had met.