Cataclysm

Amphibious. The Cataclysm can breathe air and water.

Multiattack. The Cataclysm makes three attacks, using any attack in any combination.

Wrath of the Storm. Melee Attack Roll: +14, reach 10 ft. Hit: 23 (4d6 + 9) Bludgeoning damage plus 13 (3d8) Lightning damage.

Thunderbolt. Ranged Attack Roll: +14, range 500 ft. Hit: 22 (2d12 + 9) Lightning damage, and the target has the Blinded and Deafened conditions until the start of the giant’s next turn.

Lightning Storm (Recharge 5–6). Dexterity Saving Throw: DC 18, each creature in a 10-foot-radius, 40-foot-high Cylinder originating from a point the giant can see within 500 feet. Failure: 55 (10d10) Lightning damage. Success: Half damage.

Flaming Winds. Melee Attack Roll: +11, reach 10 ft. Hit: 21 (4d6 + 7) Bludgeoning damage plus 15 (3d10) Fire damage.

Boulder Throw. Ranged Attack Roll: +11, range 60/240 ft. Hit: 23 (3d10 + 7) Bludgeoning damage plus 4 (1d8) Force damage, and the target is pushed up to 15 feet straight away from the giant and has Disadvantage on the next attack roll it makes before the end of its next turn.

Frost Cleave. Melee Attack Roll: +9, reach 10 ft. Hit: 19 (2d12 + 6) Slashing damage plus 9 (2d8) Cold damage.

Ice Arrow Ranged Attack Roll: +9, range 150/600 ft. Hit: 17 (2d10 + 6) Piercing damage plus 10 (3d6) Cold damage, and the target’s Speed decreases by 10 feet until the end of its next turn.

Spellcasting. The Cataclysm casts one of the following spells, requiring no Material components and using Wisdom as the spellcasting ability (spell save DC 18):

At Will: Detect Magic, Light, Control Weather

5/Day: Whirlwind, Fire Storm, Earthquake

Cataclysmic Rage (Recharges after a Short or Long Rest). The Cataclysm enters a rage. The rage lasts for 1 minute or until the Cataclysm is incapacitated. While raging, the giant gains the following benefits:

• The Cataclysmhas advantage on Strength checks and Strength saving throws.
• When it makes a melee weapon attack, the giant gains a +6 bonus to the damage roll.
• The Cataclysm has resistance to bludgeoning, piercing, and slashing damage.

Deflect Missile (Recharge 5–6). Trigger: The Cataclysm is hit by a ranged attack roll and takes Bludgeoning, Piercing, or Slashing damage from it. Response: The Cataclysm reduces the damage it takes from the attack by 55 (5d10 + 6), and if that damage is reduced to 0, the giant can redirect some of the attack’s force. Dexterity Saving Throw: DC 20, one creature the Cataclysm can see within 60 feet. Failure: 11 (5d10 + 6) Force damage.

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

Gust. The Cataclysm targets a creature it can see within 120 feet of it and creates a magical gust of wind around the target, who must succeed on a DC 20 Strength saving throw or be moved up to 30 feet in any horizontal direction the giant chooses.

Thunderbolt (Costs 2 Actions). The Cataclysm hurls a thunderbolt at a creature it can see within 600 feet of it. The target must make a DC 22 Dexterity saving throw, taking 44 (8d10) thunder damage on a failed save, or half as much damage on a successful one.

One with the Storm (Costs 3 Actions). The Cataclysm vanishes, dispersing itself into the storm surrounding its lair. The Cataclysm can end this effect at the start of any of its turns, becoming a Cataclysm once more and appearing in any location it chooses within its lair. While dispersed, the Cataclysm can’t take any actions other than lair actions, and it can’t be targeted by attacks, spells, or other effects.