Ancient Blue Flare Dragon

Burn Hotter  Feature description the dragon can target a creature the targeted creature must succeed a constitution saving throw the DC equals its master's or lose all its Resistance and gain vulnerability to fire damage to fire attacks. Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Fire Sense Feature description The dragon knows any location a fire that is 60ft around it

Fire Form The dragon can use its 3 of its masters Flame points to become resistance to bludgeoning, piercing, and slashing from nonmagical attacks

Fire flare Feature description The dragon whenever it is sunny can deal can have all fire based spells deal an extra 5 damage

Fire Blaze Feature description The Dragon can use 2 of its masters Fire points to choose 1 creature. the chosen creature must succeed a Dexterity saving throw or catch fire deal 1d6 fire damage

Eternal Protector Feature Description when its master has half its hit points or lower it instantly returns to its masters side and can use its bonus action to take damage that the Inferno would take until the start of its next turn

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

Blue Inferno Dragon Rush Melee Weapon Attack: +17 to hit, reach 5 ft., one target. Hit: 24 (4d12 + 30) fire damage.

Bite Melee Weapon Attack: +17 to hit, reach 15 ft., one target. Hit: 21 (4d10 + 20) piercing damage.

Claw Melee Weapon Attack: +17 to hit, reach 10 ft., one target. Hit: 17 (4d6 + 20) slashing damage.

Tail Melee Weapon Attack: +17 to hit, reach 20 ft., one target. Hit: 19 (4d8 + 20) bludgeoning damage.

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 24 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.

Inferno Breath (Recharge 5-6): The dragon uses one of the following breath Weapons. The dragon exhales fire in a 90-foot cone. Each creature in that area must make a DC 24 Dexterity saving throw, taking 71 (13d10) fire damage on a failed save, or half as much damage on a successful one.

Ultimate revenge When the Dragons master is hit and takes damage the dragon can attack the creature that attacks it master but it takes double the damage

The Ancient Blue Inferno Dragon 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 Ancient Blue Inferno Dragon regains spent legendary actions at the start of its turn.