Man-Serpent (5e Creature)
From D&D Wiki
Large monstrosity, neutral evil
Charming Gaze. The target must succeed on a will saving throw or be charmed(DC 15).
Spellcasting. The man-serpent's innate spellcasting is its charisma. They can cast the spells of a 6th level sorcerer.
(1/day) each: Sleep, Chromatic Orb, Blur.
Multiattack. The man-serpent makes two attacks: one with its bite, and one with its Constrict.
Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 9 (1d6 + 4) piercing damage and the target must succeed on a DC 13 Constitution saving throw or be poisoned for 1 minute.
Constrict. Melee Weapon Attack: +6 to hit, reach 10 ft. one Medium or smaller creature. Hit: 11 (2d6 + 4) bludgeoning damage and the target is grappled (escape DC 15). Until this grapple ends, the target is restrained, and the man-serpent can't constrict another target.
Man-serpents are huge, snake-like creatures with human heads. Their "hair" is a mass of tiny snakes, and their face often emits an unearthly golden glow. They are cold-blooded with glittering black scales and grow to an adult length of 20 to 40 feet. Wise and patient, these creatures can stay still for hours but move swiftly when alarmed. They favor resting in a semi-aware state that conserves their energy and makes them very hard to surprise.
From Robert E. Howard's The God in the Bowl.