Catastrophic Awakening (Recharges after a Short or Long Rest). If the Chromistalan Tarrasque would be reduced to 0 hit points, its current hit point total instead resets to 250 hit points, it recharges its Apocalyptic Roar, and it regains any expended uses of Legendary Resistance. Additionally, the Chromistalan Tarrasque can now use the options in the “Mythic Actions” section for 1 hour. Award a party an additional 155,000 XP (310,000 XP total) for defeating the Chromistalan Tarrasque after its Catastrophic Awakening activates.
Legendary Resistance (5/Day). If the Tarrasque fails a saving throw, it can choose to succeed instead.
Magic Resistance. The Tarrasque has advantage on saving throws against spells and other magical effects.
Indefinite Regeneration. The Chromistalan Tarrasque regains 25 hit points at the start of its turn. The Tarrasque dies only if it starts its turn with 0 hit points and doesn't regenerate. This trait can be removed only by the casting of the Wish or through similar magical effects.
Reflective Carapace. Any time the Tarrasque is targeted by a magic missile spell, a line spell, or a spell that requires a ranged attack roll, roll a d6. On a 1 to 5, the Tarrasque is unaffected. On a 6, the Tarrasque is unaffected, and the effect is reflected back at the caster as though it originated from the Tarrasque, turning the caster into the target.
The Reflective Carapace can be targeted separately for attacks. It has a 25 AC, 300 hit points, and immunity to nonmagical bludgeoning, piercing, and slashing damage, as well as psychic and poison damage. The Reflective Carapace benefits from the Reflective Carapace trait. Should the Reflective Carapace be reduced to 0 hit points, the Chromistalan Tarrasque loses the Reflective Carapace trait and immediately activates its Catastrophic Awakening trait. The Reflective Carapace, if destroyed, regrows over the course of 3d12 days. The Chromistalan Tarrasque can expend its Hit Dice over the course of a Short Rest, forgoing regaining any hit points, to instead repair the Reflective Carapace, provided it is not destroyed.
Siege Monster. The Tarrasque deals double damage to objects and structures.
Thunderous Devastation. At the start of each of the Tarrasque's turns, each creature within 30 feet of it takes 10 (3d6) thunder damage.
Multiattack. The Chromistalan Tarrasque can use its Frightful Presence. It then makes five attacks: one with its bite, two with its claws, one with its horns, and one with its tail. It can use its Swallow instead of its bite.
Bite. Melee Weapon Attack: +19 to hit, reach 10 ft., one target. Hit: 36 (4d12 + 10) piercing damage. If the target is a creature, it is grappled (escape DC 20). Until this grapple ends, the target is restrained, and the Tarrasque can’t bite another target.
Claw. Melee Weapon Attack: +19 to hit, reach 15ft., one target. Hit: 28 (4d8 + 10) slashing damage.
Horns. Melee Weapon Attack: +19 to hit, reach 10ft., one target. Hit: 32 (4d10 + 10) piercing damage.
Tail. Melee Weapon Attack: +19 to hit, reach 20ft., one target. Hit: 24 (4d6 + 10) bludgeoning damage. If the target is a creature, it must succeed on a DC 20 Strength saving throw or be knocked prone.
Frightful Presence. Each creature of the Chromistalan Tarrasque’s choice within 120 feet of it and aware of it must succeed on a DC 17 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, with disadvantage if the Tarrasque is within line of sight, 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 Tarrasque’s Frightful Presence for the next 24 hours.
Swallow. The Chromistalan Tarrasque makes one bite attack against a Large or smaller creature it is grappling. If the attack hits, the target takes the bite’s damage, the target is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the Tarrasque, and it takes 56 (16d6) acid damage at the start of each of the Tarrasque’s turns.
If the Chromistalan Tarrasque takes 60 damage or more on a single turn from a creature inside it, the Tarrasque must succeed on a DC 20 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the Tarrasque. If the Tarrasque dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 30 feet of movement, exiting prone.
Apocalyptic Roar (Recharge 5–6). The Chromistalan Tarrasque roars with cataclysmic force, effecting all creatures, objects, and structures in a 300 ft. cone. All creatures caught in the blast must succeed a DC 27 Constitution Saving Throw, taking 78 (12d12) thunder damage on a failed save, or half as much damage on a successful one. Objects and structures caught in the blast take twice as much damage.
The tarrasque 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 tarrasque regains spent legendary actions at the start of its turn.
Attack. The tarrasque makes one claw attack or tail attack.
Move. The tarrasque moves up to half its speed.
Chomp (Costs 2 Actions). The tarrasque makes one bite attack or uses its Swallow.
If the Tarrasque's Catastrophic Awakening trait has activated in the last hour, he can use the options below as legendary actions.
Gaze of Aeons (Costs 1 Action). The passing gaze of the Tarrasque subjects a single living creature within 30 feet which can see it to the unspeakable passing of aeons. Said creature must succeed a DC 27 Wisdom Saving Throw or become paralyzed. While paralyzed in this way, a creature spends its turns attempting to comprehend the sensation of feeling the world corrode away before the span of eternity and can speak, but only incomprehensible utterances. A friendly creature can spend its Action to shake a creature and end this effect. Otherwise, an affected creature can repeat this Saving Throw at the end of each of their turns, ending the effect on a success. Taking any form of damage exceeding 20 hit points also ends this effect on a creature.
Awaken Savagery (Costs 2 Actions). The Tarrasque's mere presence awakens the primal urge to destroy within those who surround it. Every Beast, Monstrosity, and Humanoid within 60 feet of the Tarrasque must make a DC 22 Wisdom Saving Throw. Creatures which fail this saving throw are [condition]charmed[/charmed]. While [condition]charmed[/charmed] in this manner, they are overwhelmed with the ravening urge to consume and destroy, and must spend their Turns attacking the nearest creature to them. At the end of an effected creatures turn, it can repeat this Saving Throw, ending the effect on a success.
Animate Domain (Costs 3 Actions). The very environment falls victim to the overwhelming hunger of the Tarrasque, lashing out in an attempt to destroy all in its wake. The Tarrasque gains the following actions it can take, affecting an area of 120 feet centered on the Tarrasque (spell save DC 22, +15 to hit with ranged magical attacks):
Grasses and Undergrowth. Any area of ground in the cube that is covered by grass or undergrowth is difficult terrain for your enemies.
Trees. At the start of each of your turns, each of your enemies within 10 feet of any tree in the cube must succeed on a Dexterity saving throw or take 6d8 slashing damage from whipping branches.
Roots and Vines. At the end of each of your turns, one creature of your choice that is on the ground in the cube must succeed on a Strength saving throw or become restrained until the spell ends. A restrained creature can use an action to make a Strength (Athletics) check against your spell save DC, ending the effect on itself on a success.
Rocks. As a bonus action on its turn, the Tarrasque causes a loose rock in the area to launch at all creatures you can see in the cube. Make a ranged spell attack against all targets in range, making a single roll to hit against all of their AC's. On a hit, a creature takes 3d10 nonmagical bludgeoning damage, and it must succeed on a Strength saving throw or fall prone.
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