Ark'til

Legendary Resistance (3/Day). If the Ark'til fails a saving throw, it can choose to succeed instead.

Multiattack. The ark'til can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: 19 (2d10 + 8) piercing damage.

Claw. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 15 (2d6 + 8) slashing damage.

Tail. Melee Weapon Attack: +14 to hit, reach 20 ft., one target. Hit: 17 (2d8 + 8) bludgeoning damage.

Frightful Presence. Each creature of the ark'til's choice that is within 120 feet of the ark'til and aware of it must succeed on a DC 18 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the ark'tils Frightful Presence for the next 24 hours.

Breath Weapon (Recharge 5–6). The ark'til uses one of the following breath weapons:

Lightning Breath. The ark'til exhales lightning in an 90-foot line that is 10 feet wide. Each creature in that line must make a DC 21 Dexterity saving throw, taking 56 (16d6) lightning damage on a failed save, or half as much damage on a successful one.