5e SRD:Night Hag
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Medium fiend, neutral evil
Skills Deception +7, Insight +6, Perception +6, Stealth +6
Innate Spellcasting. The hag's innate spellcasting ability is Charisma (spell save DC 14, +6 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.
Claws (Hag Form Only). Melee Weapon Attack: +7 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.
Etherealness. The hag magically enters the Ethereal Plane from the Material Plane, or vice versa. To do so, the hag must have a heartstone in her possession.
Nightmare Haunting (1/Day). While on the Ethereal Plane, the hag magically touches a sleeping humanoid on the Material Plane. A protection from evil and good spell cast on the target prevents this contact, as does a magic circle. As long as the contact persists, the target has dreadful visions. If these visions last for at least 1 hour, the target gains no benefit from its rest, and its hit point maximum is reduced by 5 (1d10). If this effect reduces the target's hit point maximum to 0, the target dies, and if the target was evil, its soul is trapped in the hag's soul bag. The reduction to the target's hit point maximum lasts until removed by the greater restoration spell or similar magic.
Sly and subversive, night hags want to see the virtuous turn to villainy: love turned into obsession, kindness turned to hate, devotion to disregard, and generosity to selfishness. Night hags take perverse joy in corrupting mortals.
Soulmongers. While a humanoid sleeps, a night hag can straddle the person ethereally and intrude upon its dreams. Any creature with truesight can see the hag's spectral form straddling its prey. The ethereal hag fills her victim's head with doubts and fears, in the hope of tricking it into performing evil acts in the waking world. The hag continues her nightly visitations until the victim finally expires in its sleep. If the hag has driven her victim to commit evil deeds, she traps its corrupted soul in her soul bag (see the "Night Hag Items" sidebar) for transport to Hades.
Covens. A night hag that is part of a coven (see the "Hag Covens" sidebar) has a challenge rating of 7 (2,900 XP).