Chromatic Awakening (Recharges after a Short or Long Rest). If the greatwyrm would be reduced to 0 hit points, its current hit point total instead resets to 425 hit points, it recharges its Breath Weapon, and it regains any expended uses of Legendary Resistance. Additionally, the greatwyrm can now use the options in the “Mythic Actions” section for 1 hour. Award a party an additional 105,000 XP (210,000 XP total) for defeating the greatwyrm after its Chromatic Awakening activates.
Legendary Resistance (4/Day). If the greatwyrm fails a saving throw, it can choose to succeed instead.
Unusual Nature. The greatwyrm doesn’t require food or drink.
Multiattack. The greatwyrm makes one Bite attack and two Claw attacks.
Bite. Melee Weapon Attack: +18 to hit, reach 15 ft., one target. Hit: 21 (2d10 + 10) piercing damage plus 13 (2d12) force damage.
Claw. Melee Weapon Attack: +18 to hit, reach 10 ft., one target. Hit: 19 (2d8 + 10) slashing damage. If the target is a Huge or smaller creature, it is grappled (escape DC 20) and is restrained until this grapple ends. The greatwyrm can have only one creature grappled this way at a time.
Tail. Melee Weapon Attack: +18 to hit, reach 20 ft., one target. Hit: 19 (2d8 + 10) bludgeoning damage. If the target is a creature, it must succeed on a DC 26 Strength saving throw or be knocked prone.
Breath Weapon (Recharge 5–6). The greatwyrm exhales a blast of energy in a 300-foot cone. Each creature in that area must make a DC 26 Dexterity saving throw. On a failed save, the creature takes 78 (12d12) lightning damage. On a successful save, the creature takes half as much damage.
Innate Spellcasting: The Greatwyrm's spellcasting ability is Charisma (spell save 24, +16 to hit)
At will: Lightning lure, Thunderclap
5 each/day (2nd level): Thunderwave, Gust of wind, Warding wind
4 each/day (3rd level): Lightning bolt, Thunder step, Major image, Call lightning, Wind wall
3 each/day (5th level): Arcane eye, Control winds
2 each/day (6th level): Chain lightning, Wind walk, Investiture of wind
1 each/day (7th level): Project image, Whirlwind
The greatwyrm 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 greatwyrm regains spent legendary actions at the start of its turn.
Attack. The greatwyrm makes one Claw or Tail attack.
Wing Attack (Costs 2 Actions). The greatwyrm beats its wings. Each creature within 30 feet of it must succeed on a DC 26 Dexterity saving throw or take 17 (2d6 + 10) bludgeoning damage and be knocked prone. The greatwyrm can then fly up to half its flying speed.
Arcane Spear (Costs 3 Actions). The greatwyrm creates four spears of magical force. Each spear hits a creature of the greatwyrm’s choice it can see within 120 feet of it, dealing 12 (1d8 + 8) force damage to its target, then disappears.
If the greatwyrm’s Chromatic Awakening trait has activated in the last hour, it can use the options below as legendary actions.
Bite. The greatwyrm makes one Bite attack.
Chromatic Flare (Costs 2 Actions). The greatwyrm flares with elemental energy. Each creature in a 60-foot-radius sphere centered on the greatwyrm must succeed on a DC 26 Dexterity saving throw or take 22 (5d8) lightning damage.
Description
The most ancient chromatic dragons, who have survived over twelve hundred years of mortal life and acquired vast hoards worth millions of gold pieces, can achieve a form of apotheosis, reaching a level of power approaching that of Tiamat’s mighty aspect. The competitive avarice of dragonkind and the interference of adventurers prevent most dragons from attaining this level of power. But a chromatic dragon who can outwit all rivals and overcome all potential thieves can rise to become one of the mightiest of dragons.
Often a chromatic greatwyrm’s ascension involves fusing the power of a single dragon’s echoes across different worlds of the Material Plane. The black greatwyrm Chronepsis, for example, is said to have stalked multiple worlds and devoured many of his echoes before withdrawing to a planar lair in the Outlands. The red greatwyrm Ashardalon worked with a balor to ritually drain the power of his echoes, then infused their power into himself by implanting the balor where his heart had been.
In both size and power, chromatic greatwyrms exceed even ancient dragons. The energy of their breath weapons courses over their bodies and glows under their scales, and elemental forces rage around them when they exert their wrath. They no longer need to eat or drink, as their vast hoards magically sustain them. And their power can raze a city to the ground, destroying buildings and defenders alike.
Lair and Lair Actions
The Blue Greatwyrm's lair is the giant great storm
Lair Actions
On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the following effects; the dragon can’t use the same effect two rounds in a row:
Part of the ceiling collapses above one creature that the dragon can see within 150 feet of it. The creature must succeed on a DC 20 Dexterity saving throw or take 10 (3d6) bludgeoning damage and be knocked prone and buried. The buried target is restrained and unable to breathe or stand up. A creature can take an action to make a DC 20 Strength check, ending the buried state on a success.
A cloud of sand swirls about in a 50-foot-radius sphere centered on a point the dragon can see within 150 feet of it. The cloud spreads around corners. Each creature in the cloud must succeed on a DC 20 Constitution saving throw or be blinded 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.
Lightning arcs, forming a 10-foot-wide line between two of the lair’s solid surfaces that the dragon can see. They must be within 120 feet of the dragon and 120 feet of each other. Each creature in that line must succeed on a DC 20 Dexterity saving throw or take 10 (3d6) lightning damage.
Regional Effects
The region containing a legendary blue dragon’s lair is warped by the dragon’s magic, which creates one or more of the following effects:
Thunderstorms rage within 100 miles of the lair.
Dust devils scour the land within 15 miles of the lair. A dust devil has the statistics of an air elemental, but it can’t fly, has a speed of 50 feet, and has an Intelligence and Charisma of 1 (−5).
Hidden sinkholes form in and around the dragon’s lair. A sinkhole can be spotted from a safe distance with a successful DC 20 Wisdom (Perception) check. Otherwise, the first creature to step on the thin crust covering the sinkhole must succeed on a DC 20 Dexterity saving throw or fall 1d6 × 10 feet into the sinkhole.
If the dragon dies, the dust devils disappear immediately, and the thunderstorms abate within 1d10 days. Any sinkholes remain where they are.
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