Obajima, Tyrant of Nature

gargantuan fey (titan), neutral evil

D&D 5.5 / SRD 5.2

Challenge 30 (155,000 XP)

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STR
30 (+10)
DEX
22 (+6)
CON
28 (+9)
INT
24 (+7)
WIS
30 (+10)
CHA
28 (+9)

Defense

Armor Class
23 (natural armor)
Hit Points
875 (50d20+350 +9)
Speed
60 ft., fly 60 ft., swim 60 ft., climb 40 ft., burrow 30 ft.

Proficiencies & Senses

Saving Throws Constitution, Wisdom, Charisma
Skills
Nature +16, Survival +19, Athletics +19, Perception +19, Intimidation +18
Senses
darkvision 120 ft.
blindsight 60 ft.
tremorsense 120 ft.
truesight 120 ft.
Verdant Awareness 600 ft. (Obajima senses any creature touching natural ground, plants, or water within range.)
passive Perception 29

Characteristics

Damage Vulnerabilities
—
Damage Resistances
cold, fire, lightning, necrotic, poison, psychic
Damage Immunities
bludgeoning, piercing, slashing
Condition Immunities
charmed, frightened, grappled, paralyzed, petrified, poisoned, prone, restrained, stunned
Languages Sylvan, Common, Primordial, Telepathy 300 ft.

Spellcasting

Spellcasting

Spellcasting
Spellcasting Rule
Obajima casts one of the following spells, requiring no material components and using Wisdom as the spellcasting ability (spell save DC 26, +18 to hit with spell attacks).
Wisdom Level 20 DC 26 +18 to hit Cantrips at will Level 3 3 slots Level 5 3 slots Level 8 1 slot
Poison Spray SRD Cantrips At will

You spray toxic mist at a creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d12 Poison damage.Cantrip Upgrade. The damage increases by 1d12 when you reach levels 5 (2d12)...

Shillelagh SRD Cantrips At will

A Club or Quarterstaff you are holding is imbued with nature's power. For the duration, you can use your spellcasting ability instead of Strength for the attack and damage rolls of melee attacks using that weapon, and...

Plant Growth SRD Level 3 3 slots

Casting Time: Action (Overgrowth) or 8 hours (Enrichment)This spell channels vitality into plants. The casting time you use determines whether the spell has the Overgrowth or the Enrichment effect below.Overgrowth...

Speak with Plants SRD Level 3 3 slots

You imbue plants in an immobile 30-foot Emanation with limited sentience and animation, giving them the ability to communicate with you and follow your simple commands. You can question plants about events in the...

Insect Plague SRD Level 5 3 slots

Swarming locusts fill a 20-foot-radius Sphere centered on a point you choose within range. The Sphere remains for the duration, and its area is LightlyObscured and DifficultTerrain.When the swarm appears, each creature...

Wrath of Nature SRD Level 5 3 slots
Earthquake SRD Level 8 1 slot

Choose a point on the ground that you can see within range. For the duration, an intense tremor rips through the ground in a 100-foot-radius circle centered on that point. The ground there is Difficult Terrain.When you...

Traits and Actions

Legendary Resistance

Trait
Legendary Resistance Custom
If Obajima fails a saving throw, he can choose to succeed instead.

Legendary Resistance. Allows Obajima to replace a failed save with a success a limited number of times.

Nature's Dominion

Trait Custom
Difficult Terrain Rule
Nature's Dominion Custom
The ground within 1 mile of Obajima is difficult terrain for creatures hostile to him. Obajima ignores difficult terrain and can't be restrained by nonmagical plants.

Regeneration

Trait
Regeneration Custom
Obajima regains 40 hit points at the start of his turn if he is touching earth, water, or living plants. If he takes cold, fire, or necrotic damage, this trait doesn't function at the start of his next turn.

Regeneration. Restores hit points each turn unless suppressed by certain damage types.

Titanic Frame

Trait Custom
Titanic Frame Custom
Obajima is immune to spells and effects that would alter his form or size. He automatically succeeds on saving throws against being knocked prone or moved against his will.

Titanic Frame. Homebrew immunity to forced movement and form-altering effects.

Multiattack

Action
Multiattack Custom
Obajima makes three attacks using Worldroot Slam, Thorn Volley, or Verdant Storm, and he can use Seed of Ruin in place of one attack.

Multiattack. Obajima can replace attacks with special actions during his attack routine.

Worldroot Slam

Action
Melee Attack Custom
Melee Weapon Attack: +19 to hit, reach 20 ft., one target. Hit: 32 (4d10 + 10) bludgeoning damage plus 22 (4d10) poison damage, and the target is pushed 10 feet away.

Thorn Volley

Action
Ranged Attack Custom
Ranged Weapon Attack: +15 to hit, range 120/480 ft., up to three targets. Hit: 27 (6d6 + 6) piercing damage plus 10 (3d6) poison damage.

Verdant Storm

Action
Saving Throw Custom
Obajima calls a storm of roots and thorns in a 60-foot cone. Each creature there makes a DC 26 Dexterity saving throw, taking 45 (10d8) piercing damage plus 45 (10d8) poison damage on a failed save, or half as much on a success. The area becomes difficult terrain for 1 minute.

Seed of Ruin

Action Custom
Poisoned Condition
Seed of Ruin Custom
Obajima plants a seed in a creature he can see within 60 feet. The target makes a DC 26 Constitution saving throw. On a failure, it takes 55 (10d10) necrotic damage and is poisoned for 1 minute. While poisoned, it takes 10 (3d6) necrotic damage at the start of each of its turns.

Rooted Step

Bonus Action Custom
Rooted Step Custom
Obajima teleports up to 60 feet to an unoccupied space touching earth, water, or a plant.

Rooted Step. Homebrew short-range teleport between natural surfaces.

Withering Gaze

Bonus Action
Saving Throw Custom
One creature Obajima can see within 120 feet must succeed on a DC 26 Wisdom saving throw or have disadvantage on its next attack roll before the end of its next turn.

Verdant Reprisal

Reaction
Restrained Condition
When a creature within 30 feet hits Obajima with an attack, roots erupt around it. The attacker must succeed on a DC 26 Strength saving throw or be restrained until the end of its next turn.

Nature's Rebuke

Reaction Custom
Nature's Rebuke Custom
When Obajima takes damage from a spell, he can force the caster to make a DC 26 Constitution saving throw, taking 27 (6d8) poison damage on a failure.

Running the encounter

Combat Behavior

Tactics

  • Opens with Verdant Storm to control the battlefield, then uses Seed of Ruin on the strongest spellcaster.
  • Uses Rooted Step to reposition and Worldroot Slam to push defenders away from allies.

Combat Style

Overwhelming area denial and attrition, using terrain and regeneration to outlast foes.

Morale

Fights with arrogant certainty, expecting nature itself to obey him.

Appearance & presence

Monster Description

Obajima is a Gargantuan fey titan whose body is a living testament to nature's raw, untamed power. His form is a towering amalgamation of ancient bark, gnarled roots, and sinewy vines, standing over sixty feet tall. His skin is a patchwork of iron-hard heartwood and moss-covered stone, with deep fissures that glow faintly with a sickly green luminescence. From his broad shoulders and crown sprout a miniature forest—twisted pines, flowering creepers, and thorny brambles—that rustles and writhes with a life of its own.

His face is a mask of weathered bark, with eyes like pools of dark amber that burn with cold, calculating malevolence. Massive antlers, resembling the branches of a dead oak, curve upward from his brow, and his hands end in jagged, root-like claws that can crush stone. When he moves, the ground trembles, and the sound of grinding wood and snapping vines accompanies each step. His voice is a deep, resonant rumble, like boulders rolling through a cavern, and when he speaks, the very air seems to thicken with the scent of damp earth and decaying leaves.

He can move with surprising silence when he chooses, his form blending seamlessly into the forest canopy, but when he wishes to be known, his presence is announced by the creaking of ancient trees and the distant howl of beasts. The air around him is always cool and humid, and plants within his vicinity grow with unnatural speed, twisting toward him as if drawn by an invisible tide.

Instincts & motives

Monster behavior

Obajima is a being of immense arrogance and territoriality, viewing himself as the rightful sovereign of all wild places. He does not merely defend his domain; he seeks to expand it, bending the natural world to his will and reshaping it into a twisted reflection of his own grandeur. He is patient and calculating, often observing intruders for days before making his presence known, using his Verdant Awareness to track their every move.

When he finally confronts those who trespass, he does so with theatrical cruelty, demanding their submission and offering them a choice: serve as a vassal of his growing empire or be consumed by the land itself. He is not mindless in his aggression; he respects strength and cunning, and may spare those who impress him with their resilience or their understanding of nature, though such mercy is rare and always self-serving.

He harbors a particular hatred for druids and fey nobles who challenge his authority, seeing them as upstart rivals, and he takes great pleasure in corrupting their sacred groves and twisting their followers into monstrous servants. In his domain, he is a constant, oppressive presence, and the local wildlife reflects his mood—when he is pleased, the forest blooms with unnatural vigor; when he is angered, blights and pestilence spread like wildfire.

Habitat & life cycle

Ecology

Obajima is a unique entity, a fey titan whose existence is tied to the primal forces of the world. He does not reproduce in any conventional sense; instead, he is a living embodiment of nature's tyranny, sustained by the land itself. He draws sustenance from the vitality of the soil, the waters, and the living plants around him, and he can regenerate from even the most grievous wounds as long as he remains in contact with earth, water, or plant life.

His presence corrupts the natural order, causing plants to grow aggressively and animals to become aggressive and twisted. He often cultivates monstrous guardians from the local fauna and flora, bending them to his will through a combination of primal magic and sheer dominance. He has no natural predators, though he is wary of powerful celestials and ancient dragons who might challenge his rule. His life cycle is measured in millennia, and he has existed since the first forests took root, though he has only recently begun to actively expand his territory, driven by a newfound ambition to become the undisputed lord of all wild places.

Origins & legends

History

Obajima's origins are lost in the mists of time, but it is said he was once a guardian spirit of an ancient forest, created by the primordial forces of nature to protect the balance of life. Over millennia, however, he grew arrogant, convinced that the balance could only be maintained through absolute control. He began to twist his domain, creating a realm of terrifying beauty where only the strongest survived.

His tyranny eventually drew the attention of a coalition of druids and fey lords, who managed to seal him away in a pocket dimension for centuries. Recently, a cataclysmic event—perhaps a magical accident or the meddling of a foolish wizard—shattered his prison, and he has returned to the world more powerful and vengeful than ever. Local legends speak of a 'Green Tyrant' who stalks the deepest woods, and adventurers have reported finding entire villages swallowed by sudden, overgrown forests.

He now seeks to reclaim his lost domain and expand it, and he has begun to corrupt the ley lines themselves, a process that, if left unchecked, could turn entire regions into extensions of his will.

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