Azure Rathalos

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

Charge. If the Azure Rathalos moves at least 10ft one either the ground or air, they can choose to initiate a Melee Weapon Attack: +12 to hit, line. Hit: 16 (1d12 + 10) bludgeoning damage. Any creature large or smaller must make a DC13 Strength or Dexterity saving throw or get knocked prone. 

Frightful Presence. Each creature of the Azure Rathalos' choice that is within 120 feet of the Rathalos and aware of it must succeed on a DC 17 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 Rathalos' Frightful Presence for the next 24 hours.

Tail. Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 16 (2d8 + 7) bludgeoning damage.

Piercing Fangs. Melee Weapon Attack: +5 to hit, reach 15 ft., one target. Hit: 33 (4d12 + 7) piercing damage. 

Multiattack. The Azure Rathalos makes a Piercing Fangs attack and then a Tail attack. 

Lunging Claws. Melee Weapon Attack: +5 to hit, reach 15 ft., one target. Hit: 46 (6d12 + 7) slashing damage. If hit, the targeted creature must make a DC17 Constitution saving throw or be poisoned for 1d12 damage every turn for 3-15 turns.

Fireball. Ranged Weapon Attack: +5 to hit, range 15/70 ft., 20ft sphere. Hit: 26 (3d12 + 7) fire damage. any creature within the sphere must make a DC19 Dexterity saving throw or become poisoned with Severe Fireblight that does 2d10 damage per turn for 3 turns or until it's extinguished. 

The Azure Rathalos 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 dragon regains spent legendary actions at the start of its turn.

Detect. The Rathalos makes a Wisdom check.

Tail Attack. The Rathalos makes a tail attack.

Flame Breath (Costs 2 Actions). The Rathalos exhales a spurt of flame in a horizontal line in front of it. The line stretches up to 20 feet and is 10ft wide, any creature within the line must make a DC19 Dexterity saving throw or take 14 (2d6 + 7) fire damage and become poisoned with Severe Fireblight that does 2d10 damage per turn for 3 turns or until it's extinguished. 

Afterwards, the Azure Rathalos can fly up to half of its flying speed.

Multiattack: Charge (Costs 3 Actions). The Azure Rathalos does three charge attacks in a row, but only while on the ground. While in the air, Azure Rathalos can do a single charge and then a tail attack.

Enrage. Once every 6 turns, the Azure Rathalos can enrage for three turns. Specific attacks are replaced with altered versions. The Azure Rathalos gains an extra 5 points to every ability score so long as the enraged state lasts. 

Flaming Piercing Fangs. Melee Weapon Attack: +10 to hit, reach 15 ft., one target. Hit: 36 (4d12 + 10) piercing damage and 11 (2d10) fire damage along with becoming poisoned with Fireblight for 5 turns until put out that does 2d6 damage per turn. Replaces Piercing Fangs.

Multiattack: Fireball Barrage. (Recharge 3) The Azure Rathalos makes three fireball attacks, also forgoing all of its legendary actions for this turn. 

Multiattack: Rending Talons. (Recharge 3) The Azure Rathalos makes two lunging claw attacks at targets up to 200ft away before returning to the original position.