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Pebble - AI-generated fantasy Monster

Pebble

The first survivor was an Oread mason who joked that the mountain had tossed a pebble at him. The name traveled faster than his warning. Since then, crews seeking the ram's gem-ore have learned to map escape routes and secure their footing before approaching.

Monsters
Large elemental · CR 4 · Uncommon

Pebble

A territorial basalt ram mistaken for a boulder-studded ledge, whose mineral-rich core draws hunters into dangerous terrain.
AC16
HP68/68
CR4
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 16 · HP 68 · CR 4

Pebble

Large elemental (basalt ram), unaligned
Armor Class16 (natural armor)
Hit Points68 (8d10 + 24)
Speed
Speed 40 ft.,
Climb 30 ft.
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsStrengthDexterityConstitutionIntelligenceWisdomCharisma
Damage Resistances
Fire,
Bludgeoning, Piercing, and Slashing damage from nonmagical attacks
Immunities
Petrified,
Prone
Weaknesses
Poor Dexterity and no ranged attacks leave it less effective against distant attackers.
Its charge depends on a clear straight approach and is thwarted by terrain that breaks up its path.
Senses
Tremorsense 30 ft. while in contact with the same surface,
Passive Perception 10
Languages
None
Challenge4
Initiative−1 (Initiative Score 9)
Proficiency Bonus+2
Passive Perception10
False Appearance. While motionless on a mountain face, Pebble is indistinguishable from an ordinary rock formation or boulder outcrop.
Siege Monster. Pebble deals double damage to objects and structures.

Actions

Gore. Melee Attack Roll: +6, reach 5 ft. Hit: 13 () Bludgeoning damage.
Pebble's Tumble. Recharge 5–6. The ram moves up to its Speed in a straight line toward a target and makes one Gore attack. The path must be clear enough for it to move through. On a hit, the attack deals an extra 9 () Bludgeoning damage and 4 () Thunder damage, and the target must succeed on a Strength saving throw or be pushed up to 15 feet away and have the Prone condition.
Role
Territorial bruiser and environmental hazard
Built for
Designed as a CR 4 threat; suitable for a level 4 party or as a hazardous obstacle for higher-level characters.

Notes for the game master

Pebble's Tumble requires a clear enough straight-line path for the ram to move through.
Tremorsense does not detect creatures that are not in contact with the same surface.
The supplied immunity to Prone represents its grounded, stone-heavy nature.

Tactics

  1. Opening

    Remain motionless until creatures enter the claimed grazing shelf, then charge the largest intruder to scatter the group.

  2. Mid-fight

    Use Gore against nearby intruders and reserve Pebble's Tumble for a clear lane, a cluster, or a target whose footing is precarious.

  3. End of the fight

    If cornered, use Pebble's Tumble against the nearest threat, especially one close to a drop. Otherwise, break away along a narrow ledge when reduced to 17 hit points or fewer.

  4. Retreat

    Pebble is territorial rather than predatory. It stops pursuing when intruders leave its immediate grazing ground, unless they carry off a core fragment or block its retreat.

How it fights

Remain motionless on a mountain face until intruders approach its claimed shelf.
Charge the largest intruder first to split the group and disrupt footing.
Use Pebble's Tumble only when it has a straight approach or can threaten a creature near a drop.
Stop pursuing when intruders leave the grazing ground unless they threaten its core or escape route.

Who it attacks first

The largest intruder entering its territory
A creature carrying a fragment of its core
A creature blocking its retreat

Works well with

Unstable ledges, loose scree, and unsecured masonry magnify the danger of Pebble's charge.
A narrow ledge can make retreat routes as important as attack positions.

How to beat it

Difficult terrain that breaks up a straight approach prevents Pebble from using Pebble's Tumble effectively.
Ranged attackers can exploit its lack of a ranged attack.
Creatures not in contact with the same surface are not detected by its tremorsense.
A careful retreat from its grazing ground usually ends the encounter.

Ways to avoid a fight

Withdraw slowly beyond the boundary of its grazing shelf. Pebble generally stops pursuing once intruders leave.
Oread masons familiar with the animal may negotiate safe passage by giving it space and keeping a clear retreat route.
With careful footing and a nonlethal approach, characters may gather loose gem-ore without harming Pebble.

Ecology

A hulking quadruped of dark basalt, Pebble bears iron-veined plates and spiraled horns broad as millstones. Flecks of gem-ore glint beneath its stone hide when it shifts, and grit rasps beneath its hooves. At rest on a mountainside, it blends into a ledge of boulder-studded rock.

Behavior

Pebble stands perfectly still until someone crosses into its grazing ground, then surges forward with the grinding force of a collapsing ledge. It is territorial, not hungry for prey, and abandons pursuit once intruders leave its shelf unless they steal core ore or obstruct its escape.

How it lives

Pebble grazes on mineral-rich lichens and absorbs iron and gem-ore through its stone body. The ore slowly gathers in its core, where it shines through cracks in the basalt. Hunters prize these deposits, but harvesting them requires approaching a powerful animal on unstable ground.

Lair

Pebble has no constructed lair. It rests on a high shelf or mountain face where its motionless form resembles a natural outcrop and escape routes run along narrow ledges.

Habitat
Mountain faces, high ledges, and terraced bastions with exposed basalt and mineral-rich lichen.

Signs that it is near

Freshly cracked basalt and iron-rich dust scattered across a ledge
Broad hoof furrows scored through mineral lichen
A low grinding tremor felt through stone before the ram comes into view
Bright flecks of gem-ore caught in a trail of dark grit

Tags

Elemental,
Basalt,
Ram,
Territorial,
Mountain

Lore

The first survivor was an Oread mason who joked that the mountain had tossed a pebble at him. The name traveled faster than his warning. Since then, crews seeking the ram's gem-ore have learned to map escape routes and secure their footing before approaching.

What drives it

Protect its grazing shelf, preserve access to a retreat route, and resist anyone trying to remove ore from its core.

After the fight

Once the intruders withdraw, Pebble returns to grazing, its stone hide settling against the cliff as dust sifts down around its hooves. A broken trail or cracked terrace may remain as a warning that the mountain's ledges are not always inert.

“Since then, crews seeking the ram's gem-ore have learned to map escape routes and secure their footing before approaching.”
From its lore

Variants

A mason's Pebble bears old chisel marks from a failed harvest and avoids settlements unless provoked.
A core-bearer is an older ram with brighter ore seams and tougher plating. Increase its hit points by 20 and its AC by 1.

Hooks

Plot hooks

A crew harvesting gem-ore has vanished from a ledge where Pebble was last seen motionless.
A damaged terrace may collapse if Pebble charges across it, forcing the party to protect workers while avoiding the ram.
An Oread mason asks the party to escort a survey team that must map safe routes through Pebble's claimed shelf.

How to use it

Place Pebble on a narrow mountain shelf where players can spot the apparent boulder outcrop before it moves.
Make the terrain part of the encounter: loose scree, a steep drop, and broken footing reward caution and route planning.
Offer warning signs and a chance to back away before combat begins.
On a terraced bastion, its charge can damage unsecured masonry and turn a creature encounter into an infrastructure emergency.

Treasure

Loose gem-ore can be gathered without harming Pebble with a careful, nonlethal approach, worth about 25 to 75 gp.

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