Living Cataclysm

◆

Image promptgargantuan elemental cataclysm giant, cracked obsidian body veined with glowing lava, roaring flame, keep-sized colossus, molten dripping fists, unstoppable rampage across ruined volcanic plain, burning scorched footprints, erupting ground, heat-haze air, charred black and incandescent orange-crimson, cold blue frost at edges as weakness, thunderous stride, dark fantasy, grimdark, painterly digital art, dramatic chiaroscuro lighting, muted desaturated palette with corrupted-crimson accents, weathered post-Cataclysm atmosphere, intricate high detail, cinematic composition

Gargantuan Elemental, Chaotic Neutral

CR 19BruteElemental Plane

AC 19

HP 350 (20d20 + 140)

Speed 50 ft., Fly 50 ft.

STR

save +15

DEX

save +2

CON

save +13

INT

−2

save −2

WIS

save +8

CHA

save +1

Resistances Cold, Lightning, Thunder

Immunities Fire, Poison; Exhaustion, Grappled, Paralyzed, Petrified, Poisoned, Prone, Restrained

Senses Blindsight 120 ft.; Passive Perception 12

Languages Primordial

Traits

Legendary Resistance (3/Day).

Siege Monster. Double damage to objects.

Cataclysmic Aura. An enemy that ends its turn within 20 feet of the Living Cataclysm makes a DC 21 Dexterity save. Failure: 21 (6d6) Fire damage and is thrown 10 feet in a random direction.

Unstoppable. Nothing affects the Living Cataclysm's movement (Difficult Terrain, spells, walls — it tears through all of it, including Wall of Force).

Actions

Multiattack. Makes two Cataclysm Slam attacks and uses one Eruption.

Cataclysm Slam. Melee Attack Roll: +15, reach 20 ft. Hit: 36 (5d10 + 9) Bludgeoning damage plus 14 (4d6) Fire damage. The target makes a DC 23 Strength save. Failure: Thrown 30 feet and Prone.

Eruption. A volcanic blast at a point it can see within 60 feet. Every creature in a 20-foot-radius Sphere makes a DC 21 Dexterity save. Failure: 42 (12d6) Fire damage and Prone. Success: Half damage.

Cataclysm (Recharge 6). The Living Cataclysm erupts. Every enemy in a 60-foot Emanation makes a DC 21 Constitution save.

Failure: 77 (14d10) Fire damage, and thrown 30 feet.
Success: Half damage.

Legendary Actions (3/Round)

Slam. Makes one Cataclysm Slam.

Molten Step (Costs 2). Moves its Speed; the squares it crosses burn for 1 minute (a creature that ends its turn there takes 10 (3d6) Fire).

How to Use

A walking catastrophe. Tier 4's pure destruction.

Unstoppable — no obstacle works. Not even Wall of Force. The party can't slow it down.

Key

Cold damage (Resistance, not Immunity) and a straight damage race. This fight is a DPS race — the party must bring it from 350 HP, and it's doing the same to them. No running away.