Yaobikuni yokai monster from Japanese folklore, the immortal nun who ate mermaid flesh for D&D 5e tabletop RPG fern flower press fernflower press fernflowerpress.com, dnd, monster, creature, beast, 5e, bestiary, by cr, homebrew, tome, guide, lore, stat blocks, tools, modules, legend, folklore

YAOBIKUNI

The eternal nun who gained immortality by eating mermaid flesh.
Type: Medium undead (cursed immortal), neutral Habitat: Villages Region: Japan

Lore

Yaobikuni, whose name literally translates as “the Eight-Hundred-Year Nun,” belongs to a rare category of Japanese beings who have attained eternal life. In folklore taxonomy, she is categorized as a hito-yokai—a yokai that arose from a human—and her particular sub-type is best described as a “cursed immortal.” Her existence is a blend of divine favor and a lingering biological nightmare that has detached her from the natural cycle of death.

In appearance, Yaobikuni remains perpetually young; even after centuries, her body is that of a girl untouched by the ravages of age. She traditionally wears a severe Buddhist hood, a simple robe, and carries a staff and prayer beads. This creates a strange, unnerving contradiction between her youthful face and the ancient, weary eyes that carry the weight of countless passing eras. While immortality spares her from natural death, it does not numb her to the sensation of physical or emotional pain.

Folklore attributes her origin to a fateful encounter involving a fisherman who caught an unusual fish with a human face. He invited his neighbors to taste the meat, but one guest warned that the creature was a ningyo (mermaid) whose flesh carried a potent doom. While the meat was intended to be discarded, the fisherman’s daughter secretly tasted it. From that day forward, she ceased to age, becoming a biological anomaly in a world that moves steadily toward decay.

Realizing the weight of her immortality and watching generations of loved ones die while she remained unchanged, she eventually took monastic vows and set off on an endless pilgrimage. Since ancient times, it has been said that whoever eats mermaid flesh becomes immortal, but the legend serves as a warning that such a gift has a terrible price. She wanders the villages of Japan as a living reminder that a life without release can eventually become a crushing, eternal burden.

Stat block

Armor Class

16 (preternatural poise)

Hit Points

99 (18d8 + 18)

Speed

30 ft., swim 20 ft.

Saving Throws

Dex +7, Wis +6, Cha +7

Skills

History +5, Insight +6, Perception +6, Religion +5

Damage Resistances

bludgeoning, piercing, and slashing from non-magical attacks; necrotic

Damage Immunities

poison, disease

Condition Immunities

charmed, exhausted, frightened, poisoned

Senses

darkvision 60 ft., passive Perception 16

Languages

Abyssal, Celestial, Common; telepathy 60 ft.

Challenge

5 (1,800 XP)

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