Alpha Basilisk

Petrifying Gaze. 

At the start of the Alpha basilisk’s turn the choose where they are looking in a 60ft cone any creature must make a DC 15 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.

Multiattack. The alpha basilisk  makes two attacks: one with its bite and one with its tail.

Bite. Melee Weapon Attack: +9 to hit, reach 15 ft., one target. Hit: 21 (3d10 + 5) piercing damage plus 9(2d8) poison damage.

Tail. Melee Weapon Attack: +9 to hit, reach 15 ft. one target. Hit:15 (3d8 + 5) bludgeoning damage. A creature hit by this Attack is grappled and then restrained.

Petrifying Spray (Recharge 5–6). The Alpha Basilisk exhales a petrifying gas in a 30-foot cone. Each creature in that area must make a DC 15 Dexterity saving throw, on a failed save becoming restrained until the end off the basilisks next turn a when a creature starts its turn under this effect they cannot avert there eyes, a nothing happens on a success  on a successful one.

The Alpha Basilisk can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The Alpha Basilisk regains spent legendary actions at the start of its turn.

You Can't Escape My Sight(Costs 2 Actions). The basilisk can move up to its movement speed as well as change where it is looking.

Tail Attack. The Alpha Basilisk makes a tail attack.

Bite Attack. The Alpha Basilisk makes a tail attack.