Biadalcin

Blaze of the Sun: Fire resistant creature take normal damage from Biadalcin’s fire, non-fire resistant creatures take double damage, and all creatures also take radiant damage. 

Fire breathing Proficiency, 12+ in fire breathing (any roll to breathe fire)                

Spellcasting. Biadalcin may be a 9-level spellcaster, but he will with highest likelihood not use any of his spells. He will only use “Complete Heal” which restores his Hp to maximum and “Restore Necrotic” that erases all necrotic damage taken, both of which spells with only verbal components that Biadalcin can recharge after a short rest or if he succeed an 18 Arcana check in which case all his spells are restored.

Flaming Storm. Biadalcin covers an area within a 100 m (328 ft) radius in flames, forcing each creature within the area to pass 1 round (unless the creature has fire resistance) and deals 3D20x3D4 fire damage and 3D20 radiant damage. All creatures have disadvantage in saving throws.

Quake the Earth. Biadalcin shakes the ground by it’s strong legs and huge mass. Each creature within an area of 100 m (328 ft) must beat Biadalcin in a strength roll, and all creatures within 30 m (98 ft) have disadvantage 

Bite. Melee Attack: +13 to hit, reach 3 m (10 ft), one target, deal 3D12 + 10 piercing damage and 2D6 bludgeoning damage

Claw Swipe. Melee Attack: +13 to hit, reach 6 m (20 ft), 2 targets, deal 3D10 + 6 slashing damage

Impaling Horns. Melee Attack: +16 to hit, reach 15 m (49ft), 1 target, deal 3D12 piercing damage if the creature fails a 18 Dex saving throw. Bialdacin may also roll a Dex check which if beat the targeted creature’s will save he may deal double damage, or normal damage if the target’s saving throw was 18 or more 

Tail Strike. Melee Attack: +15 to hit, reach 20 m (66 ft), 1 target, deal 2D10 + 6 bludgeoning damage

Wing Swipe. Melee Attack: +16 to hit, reach 20 m (66 ft), 2 targets, deal 2D6 piercing, 2D6 slashing and 1D4 bludgeoning damage.

Fire Breath attack. Ranged Attack: +12 to hit, reach 90 m (295 ft), effect a cone of 30˚ degrees, deal 3D12 + 15 fire damage and 3D6 + 9 radiant damage. The target is also blinded if fail a +18 con save.

Move. Biadalcin is able to move up to 30 m (98 ft) in the air or up to 8 m (26 ft) on ground extra 

Roar of Terror. All creatures within 120 m (394 ft) become deaf if roll lower than 18 on a Constitution save.

Storm of Wings. Biadalcin create a powerful wind using his large wings, forcing each large sized or smaller creatures to roll 18 or more on a Strength or Constitution save, if fails they are all proned. 

Avenging Claws. If enemy attack Biadalcin’s legs he may make a Dex roll which require +16 to hit, and deals 3D6 piercing and 3D6 slashing damage. 

Combusting Magic. When Biadalcin is attacked by a spell, he may roll for fire breathing, and if beats the roll of the spellcaster destroy the spell. If the spell was directed toward the head or front of Biadalcin, he get advantage. 

Necrotic Retaliation. If Biadalcin is harmed by necrotic damage he may inflict the same damage onto the creature who dealt it times 1D4. 

Vengeful Flames. When Biadalcin is damaged by a physical attack, he may roll for fire breathing and if beat the attacking enemy’s dexterity save will deal 3D12 + 15 fire damage 

Breath of the Sun. Biadalcin may send a very powerful fire-blast to up to ten targets in one round, dealing 3D12 + 15 fire damage and 3D12 + 15 radiant damage. The Legendary Action may be used once every 6 rounds, and once every 3 rounds if less than 150 Hp. 

Legendary Speach. Bialdacin’s voice and aura is so forceful that all allies gain 2 inspiration and all enemies become frightened for 1D6 rounds. This action can be taken at any time, unless Bialdacin is incapable of talking. 

Magic Isolation. Biadalcin isolate all warlocks, clerics and paladins from their patron, disabling their pact bonuses and ability to cast spells. To regain his/hers spell casting ability a creature must beat Biadalcin in an arcana roll, with disadvantage the first and second round of the effect.
 
Terror of the Sky. Biadalcin may blast down fire from the sky, covering an area of 150x150 m (492x492 ft) in flames for 3 rounds, dealing 3D12 + 1D8 + 15 fire damage and 3D12 + 1 D8 + 15 radiant damage to every creature in the area for every round. All will saves and action involving moving has disadvantage for all creatures within the area, accept for those with Fire and Radiant immunity and Condition immunity blinded and deafened. He will be able to use this legendary action when he’s at least 75 m (246 ft) up in the air.