Ancient Iokali Red Dragon

Legendary Resistance (5/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Flame Lord. Iokali Reds take no damage from fire, and instead heal for an amount equal to the fire damage they would have taken. Additionally, fire damage dealt by Iokali Reds to other creatures ignores resistance and treats immunity as if it were resistance.

Searing Fury (Recharges after a Short or Long Rest). If the Iokali Red would be reduced to 0 hit points, its current hit point total instead resets to 500 hit points, it recharges its Breath Weapon, and it regains any expended uses of Legendary Resistance and Legendary Actions. Additionally, the Iokali Red can now use the options in the “Mythic Actions” section for 1 hour, and each time a creature comes into contact with or makes a melee attack on the dragon takes 11 (3d6) fire damage. Award a party an additional 120,000 XP (240,000 XP total) for defeating the greatwyrm after its Metallic Awakening activates.

Multiattack. The dragon makes four attacks: one with its bite, two with its claws, and one with its tail. It can replace its bite attack with Fire Breath.

Bite. Melee Weapon Attack: +18 to hit, reach 15 ft., one target. Hit: 28 (2d10 + 10) piercing damage, plus 18 (4d8) fire damage.

Claw. Melee Weapon Attack: +18 to hit, reach 10 ft., one target. Hit: 17 (2d6 + 10) slashing damage, plus 9 (2d8) fire damage.

Tail. Melee Weapon Attack: +18 to hit, reach 20 ft., one target. Hit: 23 (2d12 + 10) bludgeoning damage. On a hit, the target is thrown up to 20 ft. in a direction of the dragon's choice.

Fire Breath. The dragon exhales fire in a 120-foot cone. Each creature in that area must make a DC 26 Dexterity saving throw, taking 44 (8d10) fire damage on a failed save, or half as much damage on a successful one. The fire ignites all objects, terrain, and creatures it touches. Ignited creatures take 11 (3d6) fire damage at the start of each of their turns. The fire is extinguished once an affected creature receives magical healing.

The dragon can take 5 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.

Battle Presence. The dragon makes a Wisdom (Perception) check, and can move its full movement speed.

Attack. The dragon makes one tail or claw attack.

Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 20 feet of the dragon must succeed on a DC 26 Strength saving throw or take 31 (6d6 + 10) bludgeoning damage, be knocked prone, and pushed 10 ft. away from the dragon and a straight line. The dragon can then fly up to half its flying speed.

Rampage (Costs 3 Actions). The Iokali Red makes four claw attacks.

Fire Breath (Costs 3 Actions). The Iokali Red uses its Fire Breath.

If the Iokali Red's Searing Fury trait has activated in the last hour, it can use the options below as legendary actions.

Bite. The Iokali Red makes a bite attack.

Charge (Costs 2 Actions). The dragon moves its full movement speed without provoking opportunity attacks and makes one claw attack against each creature, object, and structure in its path.

Creature of Fire (Costs 3 Actions). The Iokali Red vents heat and flame from its body, igniting its scales and letting out a blast of deadly fire. Upon use, each creature and object within 60 feet of the Iokali red must succeed on a DC 26 Constitution saving throw or take 49 (14d6) fire damage, become ignited, and suffer one level of exhaustion as the water in their body boils and evaporates. On a successful save, the target takes half as much damage, does not suffer any levels of exhaustion, and is not ignited. If flying, the dragon can dive to a point on the ground within 300 feet of itself before causing the explosion.