Chaos Primordial

Chaos Storm. Incredibly fast and strong winds swirl in a 45-foot radius around the Primordial and boulders and chunks of the ground are lifted with the storm and fly around in it, pelting creatures in the area. The winds impose disadvantage on ranged attack rolls, and at the start of the Primordial's turn any creature in the area other than the Primordial must succeed on a DC 23 Strength saving throw or take 10 (3d6) bludgeoning damage and 10 (3d6) thunder damage, or half as much on a successful one. Objects in the area take the damage automatically.

Additionally, a creature that fails the saving throw by 5 or more is lifted 30 feet off the ground and is restrained in the storm, moving with it until it finds a way to anchor itself to the ground. A creature with a flying speed must succeed on a DC 23 Strength (Athletics) check at the beginning of its turn, or when it first enters the area on a turn, to be able to fly in the area. A creature already anchored to the ground in some way, or affected by the earthbind spell, is not lifted or restrained in the storm and will not move with it.

Fiery Core. Whenever a creature touches or hits the Primordial with a melee attack roll while within 10 feet of it, it takes 21 (6d6) fire damage.

Empowered Attacks. The Primordial's Attacks are treated as magical for the purpose of overcoming resistance and immunity to nonmagical weapons.

Innate Spellcasting. The Primordial's innate spellcasting ability is Charisma (spell save DC 23). It can innately cast the following spells, requiring no components.

At Will: move earth, control water, control weather, control winds, control flames, transmute rock, create or destroy water, earthbind

3/day each: wall of fire, wall of stone, wind wall, wall of water

1/day each: earthquake, tsunami, storm of vengeance, fire storm

Magic Resistance. The Primordial has advantage on saving throws against spells and other magical effects.

Legendary Resistance (3/Day). If the Primordial fails a saving throw, it can choose to succeed instead.

Elemental Disaster. The Primordial deals quadruple damage to unsecured objects and structures.

Unstable Magic. When the Primordial casts a spell with its Innate Spellcasting trait that requires concentration, it can choose to alter the spell to not require concentration for that casting. In return, the spell only lasts until the end of the Primordial's next turn.

Stone Plating. No Single attack can deal more than 50 damage to the Primordial.

Multiattack. The Primordial can make four slam attacks or it can use its water jets twice.

Slam. Melee Weapon Attack: +17 to hit, reach 15 ft., one target. Hit: 13 (1d10+8) bludgeoning damage plus 11 (2d10) lightning damage.

Water Jets. The Primordial propels water from its arms at incredibly high pressures in a 150-foot line that is 5 feet wide. Creatures in the line must succeed on a DC 23 Dexterity saving throw or take 27 (5d10) piercing damage and 27 (5d10) bludgeoning damage, or half as much on a successful one. Objects in the area take the damage automatically. The line stops once it has reached its maximum range or when it has dealt 50 or more damage to creatures in the line.

Earth Wave (Recharge 4-6). The Primordial pounds on the earth, creating a shockwave that shatters the ground in a 60-foot radius around him. All structures in the area take 125 thunder damage and each other creature touching the ground in the area must succeed on a DC 23 Dexterity saving throw or be knocked prone and take 78 (12d12) bludgeoning damage. On a success a creature takes half as much damage and is not knocked prone.

Chaos Beam (Recharge 6). The Primordial launches a beam of concentrated, steaming, electrified, stone-filled water that hits all creatures in a line that is 1 mile long and 15 feet wide. All creatures within the area must succeed on a DC 23 Dexterity saving throw or take 35 (10d6) fire damage, 35 (10d6) lightning damage, 33 (6d10) bludgeoning damage and 33 (6d10) piercing damage, or half as much damage on a successful save. Objects take the damage automatically.

Absorb the Elements. When the Primordial is subjected to acid, fire, lightning or thunder damage it can choose to take no damage and instead regains a number of hit points equal to half the damage dealt.

The Primordial 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 Primordial regains spent legendary actions at the start of its turn.

Elemental Weakening. The Primordial targets one creature within 60 feet of it. The target must succeed on a DC 23 Constitution saving throw or lose all resistances and immunities to lightning, thunder and fire damage until the end of its next turn as the Primordial taps into the basic components that compose the target and tears them apart, weakening the creature

Slam. The Primordial makes one slam attack.

Water Jet (Costs 2 Actions). The Primordial uses its water jet.

Shape The Elements (Costs 2 Actions). The Primordial casts one spell with its Innate Spellcasting trait.