City Slayer Hag

Legendary Resistance (3/Day). If the hag fails a saving throw, she can choose to succeed instead.

Innate Spellcasting. The hag's innate spellcasting ability is Charisma (spell save DC 18, +10 to hit with spell attacks). She can innately cast the following spells, requiring no material components:

At will: Druidcraft, Vicious Mockery, Plant Growth, Grasping Vine

1/Day each: Erupting Earth, Giant Insect, Insect Plague, Wall of Thorns

Magic Resistance. The hag has advantage on saving throws against spells and other magical effects.

Snicker-snack. If the hag scores a critical hit with her Claws attack, the attack deals 10 additional points of Slashing damage and she severs an arm of the creature she attacked. This effect can only trigger once and its use recharges on a long rest.

Shared Spellcasting. While all three members of a hag coven are within 30 feet of one another, they can each cast the following spells from the wizard’s spell list but must share the spell slots among themselves:

1st level (4 slots): identify, ray of sickness

2nd level (3 slots): hold person, wither and bloom

3rd level (3 slots): bestow curse, counterspell, lightning bolt

4th level (3 slots): phantasmal killer, polymorph

5th level (2 slots): contact other plane, scrying

6th level (1 slot): eyebite

For casting these spells, each hag is a 12th-level spellcaster that uses Intelligence as her spellcasting ability. The spell save DC is 16, and the spell attack bonus is +8.

Usurper of Power. The City Slayer hag retains the Shared Spellcasting feature even if the other Hags in her coven are dead.

Multiattack. The hag makes two Claw or Hurl Bile attacks.

Claws. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage plus 9 (2d8) acid damage. 

Hurl Bile. Ranged Weapon Attack: +7 to hit, range 60 ft., one target. Hit: 17 (4d6 + 3) acid damage. Creatures hit by this attack take 7 (2d6) acid damage at the end of their next turn.

Foul Stuffing (1/day). The hag magically conjures a large mass of necrotic flesh inside the belly of a creature within 60 ft. of her. At the start of their turn, the afflicted creature can choose whether it wants to vomit it out or keep it down. When they choose to vomit, they must spend their action and they get rid of some of the flesh in them. When they choose to keep it down, they must make a DC 18 Constitution save or they are forced to vomit anyways and they are incapacitated until the end of their turn. The afflicted creature must vomit three times to get rid of all the flesh in their belly. While there is any necrotic flesh remaining in an afflicted creature, it takes 4d8 Necrotic damage at the end of their turn.

Consume Hag. The hag grabs a living Green Hag or a Green Hag corpse within 5 ft. of her and eats it, immediately killing it in the process. When doing so, she recovers 120 health and one spell slot of her covenant's Shared Spellcasting feature of her choice.

Attach Arm. The hag picks up a severed arm within 5 ft. of her and magically grafts it to her body. When doing so, she recovers 30 health and gains access to the Slap bonus action.

Slap. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 5 (1 + 4) bludgeoning damage. The hag can only use this bonus action if she grafted a severed arm to her body.

The hag can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The hag regains spent legendary actions at the start of her turn.

Fey Step. The hag magically teleports, along with any equipment she is wearing or carrying, up to 60 feet to an unoccupied space she can see.

Cast a Spell (Costs 2 Actions). The hag casts one of the spells from her Innate Spellcasting or Shared Spellcasting.