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Source Bestiary 3 pg. 205

Oni are a race of evil spirits, native to the Material Plane, that manifest physical bodies based upon the shapes and desires of humanoid mortals. In pure spirit form, an oni is nothing but a disembodied evil longing for the sins of the flesh. In this form, oni are harmless and invisible. The majority of these bodiless oni were once kami who failed their wards, or more often, who deliberately abandoned them. As punishment, they were stripped of their ability to form a physical body and then cast into the void. Rarely, a mortal creature's soul can become a disembodied oni upon death, or in even rarer cases, after a truly evil individual has undergone a particularly vile ritual that ends in suicide. These oni are more often destined for positions of great power and strength than most.

Eventually, an oni's spirit manifests a physical body on the Material Plane. The methods by which this may occur vary, but the process generally takes place in areas already despoiled by sin, tragedy, or cruelty. The type of oni a spirit transforms into is influenced by a wide variety of variables, ranging from the nature of what the oni spirit was before to the location where it is reborn into the realm of flesh and blood. Once an oni manifests its physical body, that body becomes its true form for the rest of its life—all oni are shapechangers, but this original form is the form in which they are born and the form they revert to upon death.

An oni's true form is always similar to that of a specific type of humanoid, save that it is always deformed and monstrous to look upon. Tusks, additional eyes, or strangely colored skin are common physical attributes. Yet while they have hideous forms, all oni are capable of changing their shape to assume forms more pleasant to the civilized eye. The type of shapes an oni can assume depend upon its species, but all can transform into some form of humanoid. Oni use this ability to infiltrate humanoid societies, either to prey upon the weak or to rule them in disguise.

In order to understand oni, it is important to consider that most of these beings were once spirits tasked with protecting a material realm they now believe is undeserving of such care and concern—indeed, the physical world is to be dominated and consumed. They arrive in physical form starved for sensory experience, and never fully sate their desire to gorge on such experiences. Most oni seek to attain positions of leadership and power, often in the guise of a normal humanoid, in order to secure a never-ending supply of sensory experiences. It is also important to understand that oni's immoderation is also motivated by their corrupted and evil natures—that is, no pleasure is more enjoyable than one that deprives or wounds another.

Oni retain their hatred of the kami upon reentering the Material Plane as physical creatures, and often their depredations and violations of the world can be directly tied to their efforts to destroy kami or the kami's works. Oni tend not to congregate with others of their kind, being most comfortable in positions of leadership over enslaved or oppressed societies populated by humanoids they can masquerade as. Yet, at times, particularly powerful oni abandon this mindset and instead gather to their side entire legions of oni drawn from all types. The oni known collectively as the yai—oni with an affinity for true giants—are most often responsible for such actions, and when a yai builds such an army of oni, the humanoid lands shake with terror.

Theoretically, as many types of oni exist as there are types of humanoids, although in reality, certain types of oni are much more populous than others. The ogre mage, an oni associated with ogres, is the best-known and most commonly encountered type of oni, for reasons that still send scholars of oni lore into spiraling arguments with seemingly no end. Beyond the oni detailed on the following pages, the atamahuta (ettins), ja noi (hobgoblins), nogitsune (kitsune), and wind yai (cloud giants) are relatively well known. Oni with associations to bugbears, great cyclopes, stone giants, trolls, troglodytes, and other races exist as well. And above even the mighty void yai there exist the oni demigods—entities of nearly incomprehensible power known as the oni daimyo.

Known Oni Daimyo

Countless oni stalk the world, slaking their greed and bloodlust to the misery of humanoids. The great leaders among the oni, beings known as daimyo, are as numerous as the nations of the world, and all oni seek to climb the rungs of power to become such powerful entities. The following list includes oni daimyo that have power in ways that make them known and feared outside their own domains. Most of these nefarious oni command armies or control points through which other oni can enter the world.
  • Akuma, the Horned King (ogre mage)
  • Chimon, Hunter of Blood (ogre mage)
  • Guyuku, the Sea Devil (water oni)
  • Inma, Empress of the World (void oni)
  • Muronna, the Dark Mother (ogre mage)
  • Nataka, the Red King (fire oni)
  • Onmyuza, Dancer in Flesh (ogre mage)
  • Ushitora, Keeper of the Oni Gate (void oni)
  • Uzumae, Daimyo of the North (kuwa oni)
  • Yabu, Lord of the Kazan Caldera (fire oni)

Creatures in "Oni" Category

Earth Yai13
Fire Yai15
Ice Yai14
Ja Noi5
Ogre Mage8
Spirit Oni2
Void Yai20
Water Yai18
Wind Yai16
Yamabushi Tengu5

Oni, Najikai

This scaly-skinned humanoid has long venomous fangs, claws, and unblinking reptilian eyes.

Najikai CR 8

Source Book of the Damned pg. 250
XP 4,800
LE Large outsider (native, oni, reptilian, shapechanger)
Init +9; Senses darkvision 60 ft., low-light vision; Perception +17


AC 22, touch 15, flat-footed 16 (+5 Dex, +1 dodge, +7 natural, -1 size)
hp 105 (10d10+50); regeneration 5 (cold, fire)
Fort +8, Ref +12, Will +11
Immune acid, poison; SR 19
Weaknesses vulnerable to cold


Speed 40 ft., fly 60 ft. (good)
Melee +1 spiked chain +15/+10 (2d6+8), bite +9 (1d6+2 plus poison)
Space 10 ft., Reach 10 ft.
Special Attacks ripping spikes, sudden shed
Spell-Like Abilities (CL 8th; concentration +11)
At will—command (DC 14), darkness, invisibility (self only)
3/day—charm monster (DC 17)
1/day—cloudkill (DC 18)


Str 20, Dex 20, Con 20, Int 18, Wis 19, Cha 17
Base Atk +10; CMB +16; CMD 32
Feats Combat Expertise, Combat Reflexes, Dodge, Improved Initiative, Mobility
Skills Bluff +16, Disguise +13, Fly +24, Knowledge (arcana, local) +17, Perception +17, Sense Motive +17, Spellcraft +17, Stealth +14, Use Magic Device +16
Languages Common, Draconic, Nagaji
SQ change shape (nagaji, alter self


Environment warm forests or mountains
Organization solitary, pair, or band (3-8)
Treasure standard (+1 spike chain, other treasure)

Special Abilities

Poison (Ex) Bite or spit—injury or contact; save Fort DC 20; frequency 1/round for 6 rounds; effect 1d2 Str damage; cure 2 consecutive saves. The save DC is Constitution-based.

Ripping Spikes (Su) The second time in a round it hits the same foe with a spiked chain attack (but no more than once per round), the najikai deals 1d4 points of bleed damage.

Sudden Shed (Su) Once per day as a swift action while in nagaji form, a najikai can slough its skin to the ground and revert to its hideous true self. Any creature within 30 feet that can see the oni must succeed at a DC 18 Will save or be nauseated for 1d4 rounds at this sight. A creature that successfully saves is only staggered for 1 round. This is a mind-affecting, vision-based effect. The save DC is Charisma-based.

Like all oni, najikai crave power and luxury. A najikai will often infiltrate a nagaji settlement, posing as a mighty warrior and easily cowing the people, with the ultimate goal of replacing the settlement’s naga ruler. The oni gets the naga’s attention with shows of strength and cunning, soon earning the najikai a position of direct service to the ruler. The oni pretends deference, but destroys the naga the instant its defenses slip, replacing it as a tyrant over the now-disgraced nagaji who failed their leader.