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Lithic Spite-Swarm - AI-generated fantasy Monster

Lithic Spite-Swarm

Minerals don't usually hold grudges, but obsidian is formed from the violent cooling of magma. Scholars believe Spite-Swarms are the leftovers of failed earth rituals, souls of the vengeful bound to the sharpest stone available.

Monsters
Large elemental · Medium · Uncommon

Lithic Spite-Swarm

A malevolent collective of tiny, sentient obsidian shards that act with a singular, jagged mind. These sprites are the physical manifestations of tectonic pressure and elemental resentment.
AC14
HP52/52
CRMedium
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 14 · HP 52 · Medium

Lithic Spite-Swarm

Large elemental (swarm), neutral evil
Armor Class14 (Natural Armor)
Hit Points52 (8d10 + 8)
Speed
30 ft.,
burrow 30 ft.
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsDexterity
SkillsStealthPerception
Damage Resistances
Bludgeoning, Piercing, Slashing from nonmagical attacks
Immunities
Condition: Charmed, Frightened, Grappled, Paralyzed, Petrified, Prone, Restrained, Stunned
Weaknesses
Thunder
Senses
Blindsight 60 ft. (blind beyond this radius),
Passive Perception 13
Languages
Terran (Understands but cannot speak)
ChallengeMedium
Proficiency Bonus+2
Earthen Meld. The swarm can burrow through nonmagical, unworked earth and stone. While doing so, the swarm doesn't disturb the material it moves through and has advantage on Dexterity (Stealth) checks.
Swarm. The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Tiny obsidian shard. The swarm can't regain hit points or gain temporary hit points.
Equipment Shredder. When a creature starts its turn in the swarm's space, the creature must succeed on a Dexterity saving throw. On a failure, any nonmagical armor made of leather or cloth that the creature is wearing takes a permanent and cumulative -1 penalty to the AC it offers. Armor reduced to an AC of 10 is destroyed. Nonmagical cloth items like capes or pouches are automatically shredded.

Actions

Multi-Faceted Laceration. Melee Weapon Attack: to hit, reach 0 ft., one creature in the swarm's space. Hit: 14 () slashing damage, or 7 () slashing damage if the swarm has half of its hit points or fewer.

Reactions

Vibrational Shift. When the swarm takes damage from a melee attack, it can use its reaction to immediately move up to half its speed without provoking opportunity attacks, potentially leaving the attacker's space.
Role
Area Denial / Equipment Degrader
Built for
3

Notes for the game master

Focus on the equipment degradation to create panic in the party.
Thunder damage causes the shards to vibrate violently, dealing double damage.

Tactics

  1. Opening

    The swarm begins hidden within a wall or floor using Earthen Meld. It waits for the heaviest party member to pass, then surges out to occupy the space of the least-armored (cloth-wearing) caster or a leather-wearing rogue.

  2. Mid-fight

    It prioritizes targets wearing cloth or leather to maximize the effectiveness of its Equipment Shredder trait. It uses Vibrational Shift to reposition if heavily targeted by melee attackers.

  3. End of the fight

    If the party uses thunder magic or breaks the swarm's cohesion (reduces to 10 HP), the shards attempt to retreat into the nearest stone wall.

  4. Retreat

    The swarm retreats if reduced below 10 HP or if a Tremor-Hulk arrives to 'call' them back via subterranean vibration.

How it fights

Always stay inside a PC's space to force the Equipment Shredder saving throw.
Target Wizards and Rogues first, as their AC depends on cloth and leather.
Use Earthen Meld to vanish between rounds if the environment allows.

Who it attacks first

Wizards/Sorcerers (Cloth armor)
Rogues/Druids (Leather armor)
Fighters/Paladins (Heavier armor is less affected, though still vulnerable to slashing damage)

Works well with

Tremor-Hulks: The swarm follows these giants, cleaning up the 'organic' remains they leave behind.
Earth Elementals: Elementals provide the vibration the swarm needs to navigate.

How to beat it

Thunderwave or Shatter spells.
Plate armor or magical armor (resistant to the shredding effect).
AoE spells that target Dexterity saves.

Ways to avoid a fight

The swarm can be lured away with a pile of high-quality leather goods or silk.
A Bard playing a rhythmic, low-frequency song might be able to charm the swarm temporarily.

Ecology

A swirling, clattering cloud of thousands of triangular obsidian fragments. Each shard is razor-sharp and vibrates with a faint, internal orange glow. When stationary, they look like a heap of volcanic glass, but when active, they move like a school of piranhas made of stone.

Behavior

They are opportunistic scavengers that remain dormant in rock faces until they feel the heavy, rhythmic vibrations of large elementals or heavy-footed humanoids. They strike in a frenzy, aiming specifically for soft materials like leather and cloth to find the 'soft meat' underneath.

How it lives

Lithic Spite-Swarms feed on the trace minerals found in tanned hides and organic fabrics. They often follow larger earth-movers like the Tremor-Hulk, feeding on the scraps and debris left behind by the larger creature's path of destruction.

Lair

Usually found clinging to the ceiling of narrow tunnels or nested within the cracks of a Tremor-Hulk's stony hide.

Habitat
Underdark, volcanic caverns, deep mountain rifts.

Signs that it is near

Perfectly shredded leather straps found on the ground
A faint, high-pitched tinkling sound like breaking glass
Walls that look 'fuzzy' with black, crystalline growth
Local wildlife found flayed of skin but otherwise untouched

Tags

Earth,
Swarm,
Obsidian

Lore

Minerals don't usually hold grudges, but obsidian is formed from the violent cooling of magma. Scholars believe Spite-Swarms are the leftovers of failed earth rituals, souls of the vengeful bound to the sharpest stone available.

What drives it

To shred organic matter into fine dust and absorb the trace energies within.

After the fight

After the battle, the PCs find their clothing and gear in tatters. They must spend time or gold to repair or replace their nonmagical equipment before their next outing.

Variants

Magmatic Spite-Swarm: Deals an additional 1d6 fire damage and glows brightly.
Shatter-Cloud: A CR 5 version that can explode upon death, dealing thunder damage.

Hooks

Plot hooks

A local library's rare manuscript collection has been turned to confetti by a swarm that emerged from the cellar walls.
The party's favorite NPC tailor has gone missing in a cavern known for its obsidian deposits.
A village's livestock are found perfectly skinned, but the meat is left untouched, leading to rumors of cult activity.

How to use it

As a secondary hazard during a fight with an Earth Elemental or Tremor-Hulk.
As an ambush in a narrow tunnel where the party's movement is restricted.

Treasure

2d6 high-quality obsidian shards (can be used as arrowheads, +1 damage to unarmored targets).
Rare mineral dust worth 50 gold pieces.

Connections

Ancestry

Elemental

Media

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