5e SRD:Sea Hag
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Medium fey, chaotic evil
Amphibious. The hag can breathe air and water.
Horrific Appearance. Any humanoid that starts its turn within 30 feet of the hag and can see the hag's true form must make a DC 11 Wisdom saving throw. On a failed save, the creature is frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, with disadvantage if the hag is within line of sight, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the hag's Horrific Appearance for the next 24 hours.
Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) slashing damage.
Death Glare. The hag targets one frightened creature she can see within 30 feet of her. If the target can see the hag, it must succeed on a DC 11 Wisdom saving throw against this magic or drop to 0 hit points.
Illusory Appearance. The hag covers herself and anything she is wearing or carrying with a magical illusion that makes her look like an ugly creature of her general size and humanoid shape. The effect ends if the hag takes a bonus action to end it or if she dies.
Sea hags live in dismal and polluted underwater lairs, surrounded by merrow and other aquatic monsters.
Ugly Inside and Out. Sea hags are by far the ugliest of all hags, with slimy scales covering their pallid skin. A sea hag's hair resembles seaweed and covers her emaciated body, and her glassy eyes seem as lifeless as a doll's. Although a sea hag can hide her true form under a veil of illusion, the hag is cursed to forever appear ugly. Her illusory form appears haggard at best.
Covens. A sea hag that is part of a coven (see the "Hag Covens" sidebar) has a challenge rating of 4 (1,100 XP).