Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.
Breath Control. The dragon has exceptional control over its ability to breathe searing light. The Burst Stream of Destruction and Ultimate Burst of Destruction actions both use the dragon’s shored up plasma reserve, so if one ability is used, it must recharge before the other can be used.
Three-Headed. When the dragon rolls a Wisdom (Perception) check or saving throw against being blinded, deafened, frightened, stunned, or knocked unconscious, it rolls three dice and uses the highest result.
Wakeful. When two of the dragon’s heads are asleep, its other head is awake.
Multiattack. The dragon can use its Frightful Presence. It then makes five attacks: three with its bite and two with its claws.
Bite. Melee Weapon Attack: +18 to hit, reach 15 ft., one creature.
Hit: 23 (2d12 + 10) piercing damage plus 18 (4d8) fire damage.
Claw. Melee Weapon Attack: +18 to hit, reach 10 ft., one creature.
Hit: 19 (2d8 + 10) slashing damage.
Tail. Melee Weapon Attack: +18 to hit, reach 20 ft., one creature.
Hit: 21 (2d10 + 10) bludgeoning damage.
Frightful Presence. Each creature of the dragon's choice that is within 120 ft. of the dragon and aware of it must succeed on a DC 22 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.
Burst Stream of Destruction (Recharge 5-6). The dragon exhales shinning white light in a 90-foot cone, or a 180-foot line. Each creature in that area must make a DC 25 Dexterity saving throw, taking 98 (28d6) fire damage on a failed save, or half as much damage on a successful one. Fire damage dealt by the dragon’s breath bypasses fire resistance, but not immunity. All creatures within 60 feet of the dragon that can see it must succeed on a DC 25 Constitution saving throw or be blinded for 1d4 rounds.
Ultimate Burst of Destruction (Recharge 5-6). Ranged Spell Attack: +18 to hit, reach 600/1,200 ft., one creature. Hit: 98 (28d6) fire damage. Fire damage dealt by the dragon’s breath bypasses fire resistance, but not immunity. This attack ignores any cover bonus to AC benefiting the target except for cover bonuses granted by objects made of adamantine. The target must succeed on a DC 25 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction is permanent unless undone with magic such as the Greater Restoration spell. On a critical hit, this attack severs one of the target’s limbs, if it has any.
The 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 dragon 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.
Toss (Costs 2 Actions). The dragon attempts to grapple up to three target large or smaller creatures using its heads. A head already grappling something can’t grapple another creature. Any creature grappled in this way is immediately thrown to a space within 30 feet of the dragon. The thrown creatures all take 19 (3d6 + 9) bludgeoning damage, or half as much on a successful DC 17 Acrobatics (Dexterity) check.
Wingbeat of Giant Dragon (Costs 2 Actions). The dragon beats its wings. Each creature within 10 feet of the dragon must succeed on a DC 21 Dexterity saving throw or take 15 (2d6 + 8) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.
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