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Core-Quake Elemental - AI-generated fantasy Monster

Core-Quake Elemental

Legend says that when the Great Fault split the Shattered Vein, the mountain's spirit was fractured. The Core-Quake Elemental is the largest fragment, wandering the tunnels as a physical manifestation of the earth's unresolved trauma.

Monsters
Large elemental · CR 7 · Unique

Core-Quake Elemental

A hulking manifestation of a mountain's geothermal fury, comprised of pressurized granite and molten core-stone.
AC16
HP114/114
CR7
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 16 · HP 114 · CR 7

Core-Quake Elemental

Large elemental (earth), neutral evil
Armor Class16 (Natural Armor)
Hit Points114 (12d10 + 60)
Speed
30 ft.,
Burrow 30 ft.
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsStrengthConstitution
SkillsAthleticsPerception
Damage Resistances
Piercing and Slashing from nonmagical attacks
Immunities
Fire,
Poison
Weaknesses
Cold
Senses
Tremorsense 60 ft.,
Darkvision 60 ft.,
Passive Perception 13
Languages
Terran,
Ignan (Understands but cannot speak)
Challenge7
Seismic Tremors. The ground within 15 feet of the elemental ripples and buckles. This area is considered difficult terrain for any creature other than an elemental.
Siege Monster. The elemental deals double damage to objects and structures.
Heated Body. A creature that touches the elemental or hits it with a melee attack while within 5 feet of it takes 5 () fire damage.

Actions

Multiattack. The elemental makes two Magmatic Slam attacks.
Magmatic Slam. Melee Weapon Attack: to hit, reach 10 ft., one target. Hit: 15 () bludgeoning damage plus 7 () fire damage.
Tectonic Surge (Recharge 5-6). The elemental strikes the ground, sending a shockwave in a 20-foot radius. Each creature on the ground in that area must make a Strength saving throw. On a failure, a creature takes 22 () bludgeoning damage and is knocked prone. On a success, the creature takes half damage and isn't knocked prone.

Reactions

Magma Spray. When the elemental takes more than 15 damage from a single melee attack, it sprays molten rock at the attacker. The attacker must make a Dexterity saving throw or take 10 () fire damage.
Role
Area Control Brute
Built for
7

Feats

Tough
Crusher

Notes for the game master

The elemental's weight is approximately 8 tons.
Its burrow speed allows it to move through solid rock, leaving no tunnel behind.

Tactics

  1. Opening

    Uses Tectonic Surge immediately to ground fast-moving targets and maximize the impact of its difficult terrain aura.

  2. Mid-fight

    Focuses on the most armored target, utilizing its high Strength and reach to keep them within the magma-aura.

  3. End of the fight

    If the Heart-Chamber is nearby, it will attempt to burrow toward it, using its Magmatic Slams to collapse tunnels behind it.

  4. Retreat

    The elemental never retreats as long as its heart is lost. It fights until crumbled into gravel.

How it fights

Uses reach to strike enemies outside of their own melee range.
Positions itself in narrow hallways to ensure no one can bypass its difficult terrain aura.
Targets structures or support pillars to cause cave-ins if the party is elusive.

Who it attacks first

Characters holding crystalline objects or glowing gems.
Slow-moving melee combatants.
Characters using cold-based magic.

Works well with

Magma Mephits that can move freely in the difficult terrain.
Environmental hazards like falling stalactites triggered by the elemental's tremors.

How to beat it

Cold damage (Slows it or reduces its AC if customized).
Flight or levitation to bypass the Seismic Tremors aura.
Forced movement to push it away from structures.

Ways to avoid a fight

The party can pacify the elemental by offering it a sufficiently powerful earth-aspected gem.
Using Mold Earth or Move Earth to stabilize the ground around it temporarily.

Ecology

A massive, jagged construct of black basalt and glowing orange magma. It lacks a true face, possessing only a burning vertical fissure where a head should be. Each step drips cooling lava that quickly solidifies into jagged glass.

Behavior

Violent and obsessive, it moves with a single-minded focus toward sources of crystalline energy, smashing anything in its path while emitting a low, sub-sonic roar that vibrates in the marrow of bones.

How it lives

Born from the violent separation of a mountain's ley-line heart, this elemental seeks to reclaim its core to stabilize its crumbling form. It does not eat but absorbs minerals to maintain its rocky shell.

Lair

The Shattered Vein (specifically the 'Heart-Chamber' deep within the tectonic fault).

Habitat
Deep mountains, volcanic veins, the Shattered Vein mine.

Signs that it is near

Localized earthquakes every ten minutes
Deep rhythmic thrumming through the floor
Walls of the tunnel melting into obsidian
Shattered mining equipment fused with slag

Tags

Earth,
Fire,
Magma,
Shattered Vein

Lore

Legend says that when the Great Fault split the Shattered Vein, the mountain's spirit was fractured. The Core-Quake Elemental is the largest fragment, wandering the tunnels as a physical manifestation of the earth's unresolved trauma.

What drives it

Recover the 'Heart of the Vein' to stop its own agonizing cooling process.

After the fight

Once defeated, the elemental cools into a statue of dark rock. If its heart was returned, the statue becomes a permanent, peaceful monument. If destroyed, the local tremors intensify for 1d4 days as the mountain settles.

Variants

Obsidian-Core (CR 9): Gains Magic Resistance and higher AC but loses some Fire damage.
Fragmented Echo (CR 4): Medium size, lower HP, no Tectonic Surge.

Hooks

Plot hooks

The Shattered Vein mine has stopped production because a 'living mountain' is eating the equipment.
A group of dwarves accidentally stole the elemental's core, thinking it was a massive ruby.
The tremors caused by the elemental are threatening to collapse a surface-level village.

How to use it

A ticking-clock escape where the party must outrun the elemental through the Shattered Vein.
A guardian of a deep-earth mining expedition.

Treasure

The Core (if recovered): A 5000gp Heart-Stone that can be used to craft a Staff of Earth Elementals.
1d6 Primordial Dust (material component for earth spells).

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