Legendary Resistance (3/Day). If the Cataclysmic Entity fails a saving throw, it can choose to succeed instead.
Magic Resistance. The Cataclysmic Entity has advantage on saving throws against spells and other magical effects.
Alien Mind. If a creature deals psychic damage to the Cataclysmic Entity, that creature takes as much psychic damage as the Cataclysmic Entity.
Unnatural Healing. If the Cataclysmic Entity would take acid damage, it instead heals that much damage.
Spellcasting. the Cataclysmic Entity is a 17th-level spellcaster. Its spellcasting ability is Strength. The Cataclysmic Entity knows the following spells:
Cantrips (at will): Eldritch Blast, Fire Bolt
3rd level (at will): Call Lightning
4th level (at will): Blight
9th level (once per day): Storm of vengeance
Siege Monster. The Cataclysmic Entity deals double damage to objects and structures.
Multiattack. The Cataclysmic Entity can use its Frightful Presence. It then makes four attacks: one with its bite, one with its claw, and two with its tentacles. 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 Cataclysmic Entity can’t bite another target.
Claw. Melee Weapon Attack: +19 to hit, reach 15ft., one target. Hit: 28 (4d8 + 10) slashing damage.
Tentacle. 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 Cataclysmic Entity’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 Cataclysmic Entity 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 Cataclysmic Entity’s Frightful Presence for the next 24 hours.
Swallow. The Cataclysmic Entity 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 Cataclysmic Entity, and it takes 56 (16d6) acid damage at the start of each of the Cataclysmic Entity's turns. If a creature dies from this damage, they are disintegrated, and cannot be revived except by use of the wish spell.
If the Cataclysmic Entity takes 60 damage or more on a single turn from a creature inside it, the Cataclysmic Entity 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 Cataclysmic Entity. If the Cataclysmic Entity dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 30 feet of movement, exiting prone.
Tumultuous Screech. The Cataclysmic Entity deals 2d10 thunder damage to every creature within a 20 foot radius. Every creature that takes this damage must also make a DC 15 Constitution saving throw. on a failed save, the creature is deafened for 1d8 minutes.
The Cataclysmic Entity 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 Cataclysmic Entity regains spent legendary actions at the start of its turn.
Attack. The Cataclysmic Entity makes one claw attack or tentacle attack.
Move. The Cataclysmic Entity moves up to half its speed.
Chomp (Costs 2 Actions). The Cataclysmic Entity makes one bite attack or uses its Swallow.
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