Grumbar

The Earthlord

Elemental lord of earth, solidity, changelessness, and oaths

CR 32Greater deityNeutralElemental earthSolidityChangelessnessOaths

The Avatar of Grumbar

Gargantuan elemental (avatar), neutral

Armor Class
25 (natural armor)
Hit Points
717 (35d20 + 350)
Speed
40 ft., burrow 60 ft.
STRDEXCONINTWISCHA
30 (+10)10 (+0)30 (+10)20 (+5)20 (+5)25 (+7)
Saving Throws
Str +20, Con +20, Wis +15, Cha +17
Skills
Athletics +20, Insight +15, Perception +15
Damage Resistances
acid, cold, lightning, thunder; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities
fire, poison
Condition Immunities
charmed, frightened, paralyzed, petrified, poisoned, prone
Senses
darkvision 120 ft., tremorsense 240 ft., passive Perception 25
Languages
Primordial, Terran, telepathy 120 ft.
Challenge
32 (150,000 XP)
Proficiency Bonus
+10

Traits

Earth Glide. The avatar can burrow through nonmagical, unworked earth and stone. While doing so, he does not disturb the material he moves through.
Immutable Form. The avatar is immune to any spell or effect that would alter his form or move him against his will unless he wishes to be affected.
Legendary Resistance (4/Day). If the avatar fails a saving throw, he can choose to succeed instead.
Magic Resistance. The avatar has advantage on saving throws against spells and other magical effects.
Siege Monster. The avatar deals double damage to objects and structures.
The Mountain Endures (Mythic Trait; 1/Day). When the avatar is reduced to 0 hit points, he does not die. The ground within 120 feet rises around him, all conditions affecting him end, and he regains 360 hit points. Each other creature touching the ground in the area makes a DC 28 Dexterity saving throw, taking 45 (10d8) bludgeoning damage and falling prone on a failed save, or taking half as much damage on a successful one.

Actions

Multiattack. The avatar makes three attacks in any combination with Earthshaking Slam or Rock Hurl.
Earthshaking Slam. Melee Weapon Attack: +20 to hit, reach 20 ft., one target. Hit: 65 (10d10 + 10) bludgeoning damage. The target makes a DC 28 Strength saving throw. On a failed save, it falls prone and is stunned until the end of its next turn. On a successful save, it falls prone but is not stunned.
Rock Hurl. Ranged Weapon Attack: +20 to hit, range 120/480 ft., one target. Hit: 49 (6d12 + 10) bludgeoning damage, and the target must succeed on a DC 28 Strength saving throw or be pushed 30 feet and fall prone.
Rockslide Sweep. Each creature in a 20-foot cone makes a DC 28 Dexterity saving throw, taking 49 (6d12 + 10) bludgeoning damage and being pushed 20 feet and knocked prone on a failed save, or taking half as much damage on a successful one.
Stone Spikes (Recharge 5–6). Stone erupts from the ground in a 60-foot-radius sphere centered on a point the avatar can see within 120 feet. Each creature touching the ground in the area makes a DC 28 Dexterity saving throw, taking 78 (12d12) piercing damage on a failed save, or half as much on a successful one. The area is difficult terrain until cleared. A creature can clear one 5-foot square with an action.

Reactions

Stone Skin. When the avatar takes acid, cold, fire, force, lightning, necrotic, psychic, radiant, or thunder damage, he gains resistance to the triggering damage type, including against the triggering damage, until the start of his next turn.
Quake Backlash. When a creature within 30 feet hits the avatar with a melee attack, that creature must succeed on a DC 28 Dexterity saving throw or fall prone and drop one held object of the avatar’s choice.

Legendary Actions

The avatar can take 3 legendary actions, choosing from the options below. It regains spent legendary actions at the start of its turn.

Ground Pound. The avatar makes one Earthshaking Slam attack.
Tremor (Costs 2 Actions). Each creature touching the ground within 60 feet makes a DC 28 Dexterity saving throw, taking 36 (8d8) bludgeoning damage and being pushed 20 feet away from the avatar on a failed save, or taking half as much damage on a successful one.
Earthen Grasp (Costs 3 Actions). One creature touching the ground within 60 feet makes a DC 28 Strength saving throw. On a failed save, earth closes over it. The creature is restrained, blinded, unable to breathe, and takes 45 (10d8) bludgeoning damage at the start of each of its turns. It repeats the save at the end of each turn, ending the effect and appearing in the nearest unoccupied space on a success.

Lair Actions

On initiative count 20 (losing initiative ties), the avatar uses one lair action. It cannot use the same option two rounds in a row.

Earthquake. Each creature touching the ground within 120 feet must succeed on a DC 28 Dexterity saving throw or fall prone. Unsecured objects and structures in the area take 35 (10d6) bludgeoning damage.
Wall of Stone. A nonmagical stone wall appears on a solid surface within 120 feet. It is up to 60 feet long, 30 feet high, and 1 foot thick, has AC 20 and 200 hit points, and lasts until destroyed or dismissed.
Stone Armor. The avatar gains 50 temporary hit points and resistance to force and psychic damage until initiative count 20 on the next round.
Dust Storm. A 60-foot-radius sphere centered on a point within 120 feet becomes heavily obscured until initiative count 20 on the next round. Each creature other than Grumbar that starts its turn there must succeed on a DC 28 Constitution saving throw or take 27 (6d8) bludgeoning damage and be blinded until the start of its next turn.

Mythic Actions

The avatar can take 3 mythic actions per day, using one option at a time. It regains spent uses at dawn.

Fault Line. A 10-foot-wide, 60-foot-long fissure opens from a point the avatar can see within 120 feet. A creature on the line must succeed on a DC 28 Dexterity saving throw or fall into the 40-foot-deep fissure. The fissure remains until filled.
Weight of the World. One creature the avatar can see within 120 feet must succeed on a DC 28 Constitution saving throw or have its flying speed reduced to 0 and be restrained until the end of its next turn. A flying creature descends safely at 60 feet per round while affected.
Bury the Oathbreaker (Costs 2 Actions). One creature within 120 feet that Grumbar has heard break an oath must make a DC 28 Charisma saving throw. On a failed save, it is petrified until the end of its next turn, then takes 55 (10d10) force damage as the stone cracks away. On a successful save, it takes half as much damage and is not petrified.

Introduction

Grumbar, the Earthlord, embodies stone, soil, and the permanence of the ground beneath all mortal works. He is known as Etugen in the Hordelands and Grome among some distant duergar traditions. His priests describe him as both deity and elemental power, patient enough to outlast any kingdom.

The Grumbarryn organize their clergy into rigid Holds of priests, crusaders, and monks. They keep exact records of sworn agreements, resist sudden changes in law or custom, and carve temples directly into living rock. To break an oath witnessed by the Earthlord is to declare that one’s words have less substance than dust.

Grumbar sends an avatar when reckless magic scars the land, a planar breach displaces mountains, or intruders violate caverns claimed by his faith. He may also appear to enforce an ancient oath after every mortal witness has died.

Physical Appearance

The avatar stands as a mountain given limbs. Layers of granite, dark soil, crystal, and ore form a broad humanoid body large enough to look down upon fortress walls. Moss and roots cling to joints that grind without bending like flesh.

Amber light burns behind a cragged face. His voice arrives through the floor before it reaches the ear, and loose stones lift and settle with each word. Footprints remain as shallow depressions even on worked stone.

Roleplaying the Avatar

Grumbar speaks as though every sentence will become a permanent record. He does not debate a settled matter, but he will hear evidence that an oath was misunderstood or fraudulently obtained.

  • Pause before each answer and never hurry the final word.
  • Refer to promises by their exact terms.
  • Treat rapid changes of subject as an attempt at evasion.
  • Accept gems, carved records, and sworn labor as meaningful offerings.
  • When angered, lower the voice and let the ground answer.

Use in a Campaign

The Buried Boundary

A royal mine crosses a border fixed by an oath no living ruler remembers. Grumbar seals the tunnels until the claim is proved or renewed.

Mountain out of Place

A planar engine has shifted a peak several miles. The avatar demands its return even though a town now occupies the mountain’s former path.

Witness beneath the City

Grumbar remembers the foundation oath of a capital whose rulers deny its conditions. The party must decide whether to expose the record or renegotiate it.

The Last Stable Road

During a region-wide earthquake, the avatar holds one route open for refugees but requires each traveler to swear what they will preserve on the other side.

Lairs

Grumbar’s lairs treat stone as a responsive body. Passages close behind oathbreakers, gemstones brighten near truthful speech, and any attempt to teleport or fly draws the weight of the earth.

The Root of the Mountain

Pressure changes open and close the only safe route while seismic pulses reveal creatures touching the stone.

Hall of Recorded Oaths

Vows carved into columns become physical barriers when their speakers or heirs violate them.

The Living Quarry

Every block removed from the walls reforms elsewhere, changing cover and sealing careless excavators into side chambers.

Gemheart Cathedral

Crystalline pillars redirect spells and tremors, forcing intruders to choose between shattering valuable wards and leaving them active.

Shared References

Open a reference for its canonical description and related entries.

Grumbar as a colossal humanoid of layered stone, raw earth, moss, and gemstones with glowing amber eyes.