Sea Hag

The monster can breathe air and water.

Wisdom Saving Throw: DC , any that starts its turn within feet of the monster and can see the monster's true form.
Failure: The target has the Frightened condition until the start of its next turn.
Success: The target is immune to this monster's Horrific Appearance for 24 hours.

While within 30 feet of at least two hag allies, the monster can cast one of the following spells, requiring no Material components, using the spell's normal casting time, and using Intelligence as the spellcasting ability (spell save DC ): Augury, Find Familiar, Identify, Locate Object, Scrying, or Unseen Servant. The monster must finish a Long Rest before using this trait to cast that spell again.

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Wisdom Saving Throw: DC , the monster can see within feet.
Failure: If the target has 20 Hit Points or fewer, it drops to 0 Hit Points. Otherwise, the target takes damage.

The monster casts Disguise Self, using Constitution as the spellcasting ability (spell save DC ). The spell's duration is s.