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Storm Crown Colossus

Huge Monstrosity (storm, lightning crown), Chaotic Neutral


Armor Class 20 (natural armor)

Hit Points 230 (20d12+100)

Speed 30 ft. fly 60 ft.

STR 22 (+6)
DEX 14 (+2)
CON 20 (+5)
INT 10 (+0)
WIS 12 (+1)
CHA 8 (-1)

Saving Throws Con +10, Wis +6

Skills Perception +9

Damage Resistances lightning

Condition Immunities poisoned

Senses darkvision 120 ft., passive Perception 19

Languages Common, Primordial

Challenge 15 (13,000 XP) Proficiency Bonus +5


Legendary Resistance (3/Day). If the creature fails a saving throw, it can choose to succeed instead.
Magic Resistance. The creature has advantage on saving throws against spells and other magical effects.
Keen Senses. The creature has advantage on Wisdom (Perception) checks that rely on sight, hearing, or smell.
Stormborn Resilience. While in or adjacent to a storm, the Storm Crown Colossus regains 5 hit points at the start of its turn if it has at least 1 hit point.

Actions

Multiattack. The Storm Crown Colossus makes two Lightning Slam attacks and one Lightning Burst attack.
Lightning Slam. Melee weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 19 (3d8+6) lightning damage. A brutal crack of lightning from the crown's apex.
Lightning Slam. Melee weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 19 (3d8+6) lightning damage. A second strike from the storm-forged fists.
Lightning Burst (Recharge 5-6). The crown surges with storm energy and fires a line of lightning in a 60-foot line. Each creature in the line must make a DC 18 Dexterity saving throw, taking 28 (8d6) lightning damage on a failed save, or half as much on a successful one.

Legendary Actions

The Storm Crown Colossus can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The creature regains spent legendary actions at the start of its turn.

Detect. The creature makes a Wisdom (Perception) check.
Lightning Tail. The creature makes a tail attack.
Storm Breath (Costs 2 Actions). The creature exhales a 60-foot line of crackling lightning. Each creature in the line must make a DC 18 Dexterity saving throw, taking 21 (6d6) lightning damage on a failed save, or half as much on a successful one.

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Lore & Description

Appearance

A towering behemoth carved from storm-sculpted stone and crackling energy. Its body is a mosaic of jet-black rock threaded with veins of pale blue lightning that arc along its length. A jagged crown of solidified storm thunderheads sits atop its head, from which sparks leap and dance in the air. Its eyes glow with a cold white light, and every movement leaves a faint rumble of thunder in its wake. When it bellows, the air itself seems to tear with static, and rain follows in its shadow as if summoned by the crown itself.

Behavior & Origins

Forged in the age when sea, sky, and earth warred for dominion, the Storm Crown Colossus was crafted by ancient storm giants to guard the Tempest Nexusโ€”the source of all storms that lash the mortal world. It slumbers within storm-wracked caverns and atop cliffside watchtowers, rising only when the Nexus trembles or when intruders seek to steal its power. Its crown channels the raw power of the tempests; every bolt that crackles within it fuels its strength and tempts it to unleash chaos upon those who threaten its sacred charge. Sailors speak in hushed tones of a silver halo that appears in the clouds before a storm, and of a colossal guardian that marches from the sea to the mountains whenever the sea-borne winds grow furious. To face the Storm Crown Colossus is to face the unbridled will of a stormโ€”crashing, unpredictable, and inexorably fierce.

Generation Info

Original prompt:
"A storm colossus crowned with lightning."

Created: Feb 2, 2026
Modified: May 31, 2026

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