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Water Yai

Among the most powerful yai are those who emulate the form of storm giants. Rather than lord over their giant-kin like most oni, though, water yai prefer to lurk alone in the world's oceans (or, much more rarely, large and remote freshwater lakes). When a water yai must interact with mortals beneath the waves, they prefer to do so while disguised as a storm giant. Water yai pursue the acquisition of material wealth and riches above all other interests, garbing themselves in richly colored, magically waterproofed kimonos and adorning their monstrous faces with all manner of jewelry. These yai can infuse their kimonos with eerie magical properties, and in combat, they can also fire bolts of electricity from their third eye.

Recall Knowledge - Fiend (Religion): DC 36

Recall Knowledge - Humanoid (Society): DC 36

Water YaiCreature 17

CEHugeFiendGiantHumanoidOniWater
Source Bestiary 2 pg. 191
Perception +32; greater darkvision
Languages Common, Jotun
Skills Acrobatics +30, Arcana +29, Athletics +33, Deception +32, Intimidation +32, Nature +29, Performance +33
Str +9, Dex +6, Con +6, Int +5, Wis +9, Cha +6
Items +2 greater striking longspear
AC 40; Fort +27, Ref +29, Will +34; +1 status on all saves vs. magical
HP 295, regeneration 15 (deactivated by acid and fire); Immunities electricity
Attack of Opportunity ReactionReaction
Shocking Douse ReactionReaction Trigger A creature within 100 feet casts a fire spell; Effect The water yai flourishes their kimono and attempts a Performance check to counteract the spell before it comes into effect. If the yai counters the spell, the triggering creature takes 9d6 electricity damage from electrified water that sprays from the kimono (DC 35 basic Reflex save).
Speed 40 feet, fly 40 feet, swim 50 feet; water walk
Melee Single ActionSingle Action longspear +35 [+30/+25] (evil, magical, reach 20 feet), Damage 3d8+15 piercing plus 2d6 electricityMelee Single ActionSingle Action kimono +33 [+28/+23] (electricity, evil, magical, reach 15 feet), Damage 3d12+12 electricity plus Enveloping KimonoMelee Single ActionSingle Action fist +33 [+29/+25] (agile, evil, magical, reach 15 feet), Damage 3d8+15 bludgeoning plus 2d6 electricityRanged Single ActionSingle Action electric missile +30 [+25/+20] (electricity, evil, magical, range increment 60 feet), Damage 3d12+12 electricity plus flat-footed for 1 roundPrimal Innate Spells DC 38; 9th chain lightning, horrid wilting; 8th hydraulic torrent; 5th control water (at will); 4th charm (×3), darkness; 2nd invisibility (at will, self only); Constant (9th) water walk
Change Shape Single ActionSingle Action (concentrate, polymorph, primal, transmutation) The water yai takes on the appearance of a storm giant. This doesn't change their Speed or Strike attack and damage. The yai can also turn into a puddle of water, with the effects of gaseous form except they retain their land Speed, double their swim Speed, and can't fly.Enveloping Kimono Single ActionSingle Action (electricity, manipulate, primal, transmutation, water) Requirements The water yai's last action was a successful kimono Strike; Effect The water yai extends a portion of their kimono to attempt to envelop a creature within 15 feet. The water yai must attempt a Performance check against the creature's Reflex DC.
Critical Success The creature takes 20d6 electricity damage and is grabbed until the end of its next turn.
Success As critical success, but only 10d6 electricity damage.
Failure The target takes 5d6 electricity damage but is not grabbed.
Critical Failure The target is unaffected.

All Monsters in "Oni"

NameLevel
Fire Yai14
Frost Yai13
Onidoshi8
Water Yai17

Oni

Source Bestiary 2 pg. 188
Not all divine creations are meant to live as mortals. Some spirits are created as guardians instead, tasked as protectors of elements of nature that cannot protect themselves. When these spirits accept their divine place in the metacosmos and take on such charges, they become kami. But some of these spirits are willful, obstinate, or simply rotten, railing against such demands from the gods and becoming bodiless and unable to interact with the world they can torturously still observe. Others receive such punishment simply for failing at their duty, and their despair at their condition twists them like those that began with a seed of darkness. When these spirits look upon mortal lives and become overcome with envy of the flesh and pleasure that humanoids can revel in, they form surrogate bodies of their own and become monsters known collectively as oni.

When an oni manifests, they always do so in a form that parodies a specific humanoid ancestry closely associated with the oni’s obsessions and envies. Giants’ over-the-top personalities and sizes are likely the reason why these humanoids are the most common incarnations chosen by oni; such oni are known collectively as yai oni. Yet there exist oni associated with almost every kind of humanoid. Most oni are capable of supernaturally disguising themselves as their associated humanoid type and use this ability to infiltrate societies and seize control from within. Once established, oni typically reveal their true form and revel in dominating those they view as lesser beings fit only to serve their whims.

Oni are nothing if not vain. They typically choose comely or striking appearances in their humanoid disguises—forms that are completely at odds with the ugliness of their true natures. An oni’s true form is indicative of their innermost desires and always has features such as oversized teeth that verge into tusks, sharp claws, unusually bright skin colors, or a third eye in the forehead. Oni have desires as varied as those of any being, though by their nature these desires are almost always for hedonistic or destructive experiences of the flesh, typically food, pleasure, or violence.

Sidebar - Additional Lore Oni Daimyo

Oni daimyo are quasi-deities with isolated mortal domains. The most powerful is Inma, the Empress of the World, but Akuma the Horned King, Murona the Dark Mother, and Nataka the Red King are also worshipped.

Sidebar - Additional Lore Oni Origins

The first oni originated in the nation of Minkai on the continent of Tian Xia. Whether due to prevalent local kami— particularly in the mist-shrouded Forest of Spirits—or its peoples' faiths, Minkai is a hotbed of oni activity.

Sidebar - Additional Lore Oni Shapechangers

Oni humanoid forms are limited to one specific appearance. An ogre magecan assume only one specific ogre form, while an ice yai can appear only as one specific frost giant. Some oni have greater control over their shapeshifting power and can assume the form of any humanoid creature, and these oni tend to be the most dangerous.

Sidebar - Related Creatures Other Oni

Different oni exist for nearly every humanoid ancestry. Kuwa oni mask their golden skin and four-fingered claws in human form, while ja oni hide as hobgoblins. Other yai include wind yai (who take their form from cloud giants) and the immensely powerful void yai (who form from other yai and ascend to rule over rune giants).