Vaerrinox, the Undying Flame

Legendary Resistance (4/Day). If Vaerrinox fails a saving throw, it can choose to succeed instead.

The stories or fables of Elder Ancient Red Dragons have been viewed with much skepticism by scholars throughout the world. Until recently, it was the common belief by scholars that red dragons in general do not work well with other Dragons, let alone other red dragons. The presence of Vaerrinox flying over the city of Baulder's Gate with a small host of Adult Red Dragon, caused such panic within the city that the local Lord placed it under martial law for months. 

Scholars throughout the world have been scouring their notes and ancient locations to find more information as to the existence of these dreadful creatures. The only information that can be found or those from ancient Elvish tales from before the split of  the ancient Elvish kingdoms. It was believed that a curse was placed upon Chromatic Dragons by Bahamut, which would force the Chromatic Dragons to fight against each other as well as against their metallic cousins. 

Wizard colleges throughout the world have enacted an uneasy peace agreement, in order to pursue the studies of ancient dragons. One thing can be said for sure is that The mere presence of Vaerrinox has even put fear into the hearts of Paladins.

Vaerrinox was one of the original Red Dragon's created by the Goddess Tiamat.

• Multiattack. Vaerrinox can use its Frightful Presence, attempt to Grapple a Creature (1d20+18), or use his Breath Attack (if possible). He then makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +18 to hit, reach 15 ft., one target. Hit: 21 (2d10 + 10) piercing damage plus 26 (4d12) fire damage.

Claw. Melee Weapon Attack: +18 to hit, reach 10 ft., one target. Hit: 17 (2d6 + 10) slashing damage.

Tail. Melee Weapon Attack: +18 to hit, reach 20 ft., one target. Hit: 19 (2d8 + 10) bludgeoning damage.

Frightful Presence. Each creature of Vaerrinox's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 22 Wisdom saving throw or become frightened for 10 minutes. His Frightful Presence can even overwhelm, and bypass, the benefits gained from a Paladin's Aura of Courage. 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.

Fire Breath (Recharge 4–6). Vaerrinox exhales fire in a 90-foot cone. Each creature in that area must make a DC 24 Dexterity saving throw, taking 91 (26d6) fire damage on a failed save, or half as much damage on a successful one.

Focused Fire Breath (Recharge 5–6). Vaerrinox exhales a Plasma like fire in a 60-foot line. Each creature in that line must make a DC 24 Dexterity saving throw, taking 150 (20d12) fire damage on a failed save, or half as much damage on a successful one. If Vaerrinox uses Focused Fire Breath, he cannot use Fire Breath for a minimum of 3 rounds. Vaerrinox is able however to use Focused Fire Breath again if he makes makes the recharge roll.

Aura of Heat (Passive Damage): Any creature within 15 feet of Vaerrinox takes 5 (1d10) Fire damage. If a creature enters, or reenters, Vaerrinox' Aura the will instantly take 5 (1d10) Fire damage. If a creature is within Vaerrinox for more than a minute, any metal objects both Magical and non-magical suffer 9 (2d8) fire damage similar to that of the Heat Metal spell. This affect ends once a creature, or creatures, spends 1 minute outside of Vaerrinox' Aura. This Aura is in effect only when Vaerrinox is awake or conscious.

Vaerrinox 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. Vaerrinox regains spent legendary actions at the start of its turn.

Detect. The dragon makes a Wisdom (Perception) check.

Tail Attack. The dragon makes a tail attack.

Wing Attack (Costs 2 Actions). Vaerrinox beats his mighty wings. Each creature within 15 feet of Vaerrinox must succeed on a DC 24 Dexterity saving throw or take 17 (2d6 + 10) bludgeoning damage, knocked prone, and pushed back 5 feet. Vaerrinox can then fly up to half its flying speed.