Green Hag are surprisingly strong and can survive in unforgiving swamps and other fetid environments. You gain +2 to Strength and +1 to Constitution.

Hags can speak and understand Common, Draconic, and Sylvan.

The hag can see even in darkness. She has darkvision up to 60 ft.

The hag can breathe both air and water.

The hag’s innate spellcasting ability is Charisma. She can innately cast the following spells, requiring no material components: dancing lights, minor illusion, and vicious mockery.

The hag can mimic animal sounds and humanoid voices. A creature that hears the sounds can tell they are imitations with a successful Wisdom (Insight) check versus the hag's Performance check.

The hag's gnarled hands are more like claws. Unarmed strikes do slashing damage rather than bludgeoning.

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 Intelligence (Investigation) check versus the hag's Performance to discern that the hag is disguised.