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Medium monstrosity, lawful evil
Petrifying Gaze. When a creature that can see the medusa's eyes starts its turn within 30 feet of the medusa, the medusa can force it to make a DC 14 Constitution saving throw if the medusa isn't incapacitated and can see the creature. If the saving throw fails by 5 or more, the creature is instantly petrified. Otherwise, a creature that fails the save begins to turn to stone and is restrained. The restrained creature must repeat the saving throw at the end of its next turn, becoming petrified on a failure or ending the effect on a success. The petrification lasts until the creature is freed by the greater restoration spell or other magic.
Multiattack. The medusa makes either three melee attacks — one with its snake hair and two with its shortsword — or two ranged attacks with its longbow.
Snake Hair. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 4 (1d4 + 2) piercing damage plus 14 (4d6) poison damage.
Shortsword. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) piercing damage.
Longbow. Ranged Weapon Attack: +5 to hit, range 150/600 ft., one target. Hit: 6 (1d8 + 2) piercing damage plus 7 (2d6) poison damage.
As deadly as they are ravishing, the serpent-haired medusas suffer an immortal curse brought on by their vanity. They lurk in quiet exile among the tumbled ruins of their former lives, surrounded by the petrified remains of past admirers and would-be heroes.
Immortal Splendor. Men and women who desire eternal youth, beauty, and adoration might pray to malicious gods, beg dragons for ancient magic, or seek out powerful archmages to fulfill their wishes. Others make sacrifices to demon lords or archdevils, offering all in exchange for this gift, oblivious to the curse that accompanies it. Those who strike such bargains gain physical beauty, restored youth, immortality, and the adoration of all who behold them, granting them the influence and power they so desire. However, after years of the living like a demigod among mortals, the price for their vanity and hubris is exacted, and they are forever transformed into medusas. A medusa's hair turns into a nest of venomous serpents, and all who gaze upon the medusa are petrified, becoming stone monuments to its corruption.
Medusa Lairs. Medusas live forever in seclusion, alienated from the world around them by their monstrous form and caprice. Their homes gradually fall into disrepair until they are little more than shadowy ruins covered with thorns and creepers, riddled with obstructions and hiding places. Foolhardy looters and adventurers who enter are often unaware of the medusa's presence until the creature is among them.