Ash Thunder Roc

Keen Sight: The Ash Thunder Roc has advantage on perception checks that rely on sight.

Vulcan Body:  Any creature that hits the Ash Thunder Roc with a melee attack takes 10 fire damage

Frightful Presence: Any creature within 60ft that the Ash Thunder Roc chooses must make a DC21 Wisdom Saving throw, or be frightened for 1 minute or until saved against. Once a creature  has succeeded this save, it is immune to the effect for 24 hours.

Multiattack: The Ash Thunder Roc can make 3 attacks; Two Talon attacks and One Beak attack.  

Talon attack. Melee Weapon Attack: +15 to hit, reach 10 ft., 1 target. Hit: 53 (3d10 Piercing + 8 + 2d6 Fire + 2d6 Lightning ) damage.

Beak attack. Melee Weapon Attack: +15 to hit, reach 10 ft., 1 target. Hit: 58 (6d8 +8 +2d8 Fire +2d8 Lightning)  damage.

Pyroclastic Blast (recharge 6):  60ft Cone. DC21 Dex save, for half damage.
On Failure, any creatures within the cone take 6d10 Fire damage + 6d10 Lightning Damage, and must further make a DC21 Con saving throw or take a further 6d10 poison damage from the cloud

Pyroclastic Arc (recharge 4-6): Targets up to 4 creatures within 40ft of the Ash Thunder Roc of it's choice. Each creature must make a DC21 Dex Save or take 5d6 Lightning damage +2d6 fire damage. On a successful save, they take half damage instead.

Legendary Resistance (3/day): The Ash Thunder Roc can choose to succeed on a saving throw after it fails

Perception (Costs 1 Action): Can make a Perception check

Wing attack (Costs 2 Actions): All creatures within 15ft of the Ash Thunder Roc must make a DC21 Str Save or take 5d6 Bludgeoning/Fire damage and be knocked prone.  The Ash Thunder Roc can then move up to half its flying speed.

Feather Strike (Costs 1 Actions): Ranged Weapon Attack: +13 to hit, reach 60 ft, 1 target. Hit: 18 (2d8 +6 +1d6 Fire +1d6 Lightning)  damage.
The Ash Thunder Roc fires a hardened feather at a creature it can see within range.