Cataclysmic Rebirth (Recharges after a Short or Long Rest). If the dragon would be reduced to 0 hit points, its current hit point total instead resets to 211 hit points, it recharges its Breath Weapon, and it regains any expended uses of Legendary Resistance. Additionally, the dragon can now use the options in the “Mythic Actions” section for 1 hour. Award a party an additional 20,000 XP (40,000 XP total) for defeating the dragon after its Cataclysmic Rebirth activates
Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.
Unusual Nature. The dragon doesn’t require air, food, drink, or sleep.
Multiattack. The dragon makes one Bite attack and two Claw attacks.
Bite. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 21 (2d12 + 8) piercing damage plus 9 (2d8) necrotic damage. If the target is a Large or smaller creature, it is grappled (escape DC 22). Until this grapple ends, the target is restrained, and the dragon can’t bite a different target.
Claw. Melee Weapon Attack: +14 to hit, reach 5 ft. one target. Hit: 13 (1d10 + 8) slashing damage. If the target is a Medium or smaller creature, it is grappled (escape DC 22). Until this grapple ends, the target is restrained. The dragon has two claws, each of which can grapple one target.
Tail. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: 17 (2d8 + 8) bludgeoning damage and the target must make a DC 22 Dexterity saving throw or be knocked prone.
Cataclysmic Breath (Recharge 5–6). The dragon exhales a wave of ghostly purple flames in a 90-foot cone. Each creature in that area must make a DC 20 Dexterity saving throw, taking 54 (12d8) necrotic damage on a failed save, or half as much damage on a successful one. A creature dies if the breath reduces it to 0 hit points. Additionally, any Medium or smaller Humanoid killed by the breath’s damage, as well as every corpse of such a creature within the cone, becomes a zombie under the dragon’s control. The zombie acts on the dragon’s initiative but immediately after the dragon’s turn. Absent any other command, the zombie tries to kill any non-Undead creature it encounters.
The dragon can take 3 legendary actions, choosing from the options below. Only one legendary action 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.
Claw. The dragon makes one Claw attack.
Cataclysmic Rush (Costs 2 Actions). The dragon moves up to half its flying speed without provoking opportunity attacks, carrying with it any creatures it is grappling. During this move, if it enters the space of a Medium or smaller creature, that creature takes 4 (1d8) necrotic damage. A creature can take this damage only once per turn.
If the dragon's Cataclysmic Rebirth trait has activated in the last hour, it can use the options below as legendary actions.
Tail. The dragon makes one Tail attack.
Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 10 feet of the dragon must succeed on a DC 22 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 carrying with it any creatures it is grappling.
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