Better Green Hag

Amphibious. The hag can breathe air and water.

Innate Spellcasting. The hag's innate spellcasting ability is Charisma (spell save DC 12). She can innately cast the following spells, requiring no material components:

Spellcasting. The hag is an 12th-level spell caster. Its spellcasting ability is Charisma (spell save DC 17, +7 to hit with spell attacks.) The hag has the following Sorcerer Spells prepared:

Cantrips (at will): Dancing Lights, Friends, Prestidigitation, Poison Spray

1st level (4 slots): Charm Person, Sleep

2nd level (3 slots): Crown of Madness, Detect Thoughts, Suggestion

3rd level (3 slots): Fear, Haste, Stinking Cloud

4th level (3 slots): Polymorph, Confusion

5th level (2 slots): Dominate Person

6th level (1 slot): Mental Prison

Mimicry. The hag can mimic animal sounds and humanoid voices. A creature that hears the sounds can tell they are imitations with a successful DC 14 Wisdom (Insight) check.

Grant Wish. Twice peryear, the hag can cast a wish spell on behalf of another being. The being must be humanoid and must willingly make the wish. The hag can freely do anything according to the wording, and will often twist the wish in wicked ways. 

Claws. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage.

Illusory Appearance. The hag covers herself and anything she is wearing or carrying with a magical illusion that makes her look like another creature of her general size and humanoid shape. The illusion ends if the hag takes a bonus action to end it or if she dies.

The changes wrought by this effect fail to hold up to physical inspection. For example, the hag could appear to have smooth skin, but someone touching her would feel her rough flesh. Otherwise, a creature must take an action to visually inspect the illusion and succeed on a DC 20 Intelligence (Investigation) check to discern that the hag is disguised.

Invisible Passage. The hag magically turns invisible until she attacks or casts a spell, or until her concentration ends (as if concentrating on a spell). While invisible, she leaves no physical evidence of her passage, so she can be tracked only by magic. Any equipment she wears or carries is invisible with her.