Maria the Medusa

Maria the Medusa, Greater
In the temple of Ra in Linhir, in lower depths - meets the party including Twitch, Pasquale, Yumi (not Heragar who is captured)
Family: Medusa Large monstrosity, lawful evil Armor Class 17 (natural armor) Hit Points 250 (20d10 + 140) Speed 30 ft.
STR DEX CON INT WIS CHA 21 (+5) 19 (+4) 24 (+7) 16 (+3) 15 (+2) 18 (+4) Saving Throws Constitution +12, Wisdom +7, Charisma +9 Skills Deception +9, Insight +7, Perception +7, Stealth +9 Senses darkvision 60 ft., passive Perception 17 Languages Common Challenge 14 (11,500 XP)
Special Traits
Magic Resistance. The greater medusa has advantage on saving throws against spells and other magical effects. Magic Weapons. The greater medusa’s weapon attacks are magical. Petrifying Gaze. When a creature that can see the greater medusa’s eyes starts its turn within 30 ft. of the medusa, the medusa can force it to make a DC 17 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. Unless surprised, a creature can avert its eyes to avoid the saving throw at the start of its turn. If the creature does so, it can’t see the medusa until the start of its next turn, when it can avert its eyes again. If the creature looks at the medusa in the meantime, it must immediately make the save. If the greater medusa sees itself reflected on a polished surface within 30 ft. of it and in an area of bright light, the medusa is, due to its curse, affected by its own gaze. Actions
Multiattack. The medusa makes either three melee attacks – one with its snake hair and two with its greatsword – or two ranged attacks with its longbow Snake Hair. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) piercing damage plus 18 (4d8) poison damage. Greatsword. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 15 (3d6 + 5) slashing damage. Longbow. Ranged Weapon Attack: +9 to hit, range 150/600 ft., one target. Hit: 13 (2d8 + 4) piercing damage plus 13 (3d8) poison damage.