homebrew by Team Brievary
Innate Spellcasting. The hag's innate spellcasting ability is Charisma (spell save DC 15, +7 to hit with spell attacks). She can innately cast the following spells, requiring no material components:
Magic Resistance. The hag has advantage on saving throws against spells and other magical effects. 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 15 Wisdom (insight) check.
Claws (Hag Form Only). Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 13 2d8+4 slashing damage. Change Shape. The hag magically polymorphs into a Small or Medium female humanoid, or back into her true form. Her statistics are the same in each form. Any equipment she is wearing or carrying isn't transformed. She reverts to her true form if she dies. 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.