Basilisk Matriarch (5e Creature)
From D&D Wiki
Large monstrosity, unaligned
Petrifying Gaze If a creature starts its turn within 30 feet of the basilisk and the two of them can see each other, the basilisk can force the creature to make a DC 12 Constitution saving throw if the basilisk isn't incapacitated. On a failed save, the creature magically begins to turn to stone and is restrained. It must repeat the saving throw at the end of its next turn. On a success, the effect ends. On a failure, the creature is petrified until freed by the greater restoration spell or other magic. A creature that isn't surprised can avert its eyes to avoid the saving throw at the start of its turn. If it does so, it can't see the basilisk until the start of its next turn, when it can avert its eyes again. If it looks at the basilisk in the meantime, it must immediately make the save. If the basilisk sees its reflection within 30 feet of it in bright light, it mistakes itself for a rival and targets itself with its gaze
Multi-attack The basilisk matriarch makes 2 attacks each round, one with its Tail and one with its Bite or two with its Bite.
Acid Spray (Recharge 5-6) The Basilisk Matriarch spits out acid in a 20 foot cone in front of itself. Creatures in the area make a DC 14 Dex save, taking 13 (3d8) Acid damage on a failed save and half as much on a successful save.
Tail Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (2d6) Bludgeoning damage.
Bite Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 2) Piercing damage + 7 (2d6) Acid damage.