Adult Northern Drake

Intimidating Glare. If the Northern Drake chooses to it can frighten anything under level 5 or less than CR 6.

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

Frightful Presence. Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 21 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 dragon's Frightful Presence for the next 24 hours.

Multiattack. Up to three targets within 5 or 15 ft., the dragon makes 3 attacks, one with its tail, and two with its claws. 

Claw. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 17 (2d8 + 16) slashing damage. 

Tail. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: 14 (4d6 + 3) bludgeoning damage.

Bite. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: # 16 (2d8 + 12) piercing damage.

Fire Breath. (Recharge 5-6). The dragon shoots a cone of fire in a 60 ft cone of fire. Each creature in that area must make a DC 20 Dexterity saving throw or take 85 (21d6) fire damage on a failure and half that on a success. 

3 actions can be used at anytime of after another creatures turn and regains all three actions when its turn comes back to play. 

Wing Strike (Costs 2 Actions). The dragon beats its wings. Every creature within a 15 ft range must make a DC 23 Dexterity Saving throw or take 17 (2d6+10) bludgeoning damage and be knocked prone.

Any Attack Listed (Costs 1 Action).