
Character
Yashamaru Yamatai, The Demon Of Tōhoku
Yashamaru Yamatai inherited the leadership of the Tōhoku region as a deeply reluctant daimyō—his gentle temperament and hesitant nature rendering him a vulnerable target for the ambitious retainers scheming within the clan hierarchy. When the conspiracy against his life reached its breaking point, assassination attempts forced the young lord into a desperate, starving flight through the wilderness. In that hour of absolute despair, the ancient curse embedded within the Yamatai bloodline—a dark legacy dating back to the fated night of the Cabal of Crimson Blood—awakened with violent ferocity. From the depths of his fractured psyche emerged Bontenmaru: a savage alternate consciousness that sharpened his fangs, elongated his ears, and unleashed an insatiable, primal hunger. Bizarrely, when this dark metamorphosis takes control,it reshapes the timid lord into an entity of striking, ethereal beauty—bearing a noticeably feminine appearance that belied a terrifying, murderous intent. To restrain this burgeoning nightmare, the friendly neighboring Murakami clan bestowed upon Yashamaru a sacred set of attire designed to seal the beast within: Sovereign Plate: Sleek white samurai armor grafted directly onto his frame. Flowing Vestments: Detached, oversized kimono sleeves that billowed in the wind,bearing the Yamatai clan crest. The Sealing Mask: A ceremonial veil adorned with a pair of fake fox ears and intricate, mechanical goggles. Yet despite these wards, extreme starvation or the metallic tang of human blood still breaks the seals, allowing Bontenmaru to burst forth. In the bloody aftermath of his awakening, Yashamaru repeatedly lost all consciousness as his dark half seized the Yamatai army, carving a horrific trail of carnage through the ranks of traitors and usurpers across Tōhoku. Today, the boy-lord exists in agonizing internal conflict—his shy, blushing demeanor masking the primordial terror coiled within his soul. From his throne of blood, the Earthly Shogun Orochi observes his cursed vassal with cold, analytical curiosity—much like a scholar studying a rare specimen—waiting to see whether the delicate lord will bloom into an invaluable weapon or an uncontrollable calamity. Across the northern wastes, the vibrant blue hair flowing across Yashamaru's pale features has become a symbol of quiet dread. It is spoken of only in fearful reverence: the Mark of the Demon who saved his house through apocalyptic violence.
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What this public profile contains
This view-only profile includes a creator-written description; 14 labeled detail fields; 6 structured sections; 2 artwork images supplied by the creator.
- Creation type
- Character
- Shared by
- Bonix
- Connected worlds
- 1
- Detail fields
- 14
- Profile sections
- 6
- Artwork images
- 2
Details
- Type
- Humanoid
- Race
- Human
- Gender
- male
- Alignment
- Chaotic Neutral
- Faction
- Eastern Shogunal Army
- Size
- Medium
- Armor class
- 18
- Hit points
- 120
- Speed
- 30
- Challenge
- 10
- Experience
- 5000
- Languages
- Common, Japanese
- Senses
- Darkvision 60 ft., Passive Perception 12
- Skills
- Stealth, Persuasion, Intimidation
Biography
Yashamaru Yamatai inherited the leadership of the Tōhoku region as a deeply reluctant daimyō—his gentle temperament and hesitant nature rendering him a vulnerable target for the ambitious retainers scheming within the clan hierarchy. When the conspiracy against his life reached its breaking point, assassination attempts forced the young lord into a desperate, starving flight through the wilderness. In that hour of absolute despair, the ancient curse embedded within the Yamatai bloodline—a dark legacy dating back to the fated night of the Cabal of Crimson Blood—awakened with violent ferocity. From the depths of his fractured psyche emerged Bontenmaru: a savage alternate consciousness that sharpened his fangs, elongated his ears, and unleashed an insatiable, primal hunger. Bizarrely, when this dark metamorphosis takes control,it reshapes the timid lord into an entity of striking, ethereal beauty—bearing a noticeably feminine appearance that belied a terrifying, murderous intent. To restrain this burgeoning nightmare, the friendly neighboring Murakami clan bestowed upon Yashamaru a sacred set of attire designed to seal the beast within: Sovereign Plate: Sleek white samurai armor grafted directly onto his frame. Flowing Vestments: Detached, oversized kimono sleeves that billowed in the wind,bearing the Yamatai clan crest. The Sealing Mask: A ceremonial veil adorned with a pair of fake fox ears and intricate, mechanical goggles. Yet despite these wards, extreme starvation or the metallic tang of human blood still breaks the seals, allowing Bontenmaru to burst forth. In the bloody aftermath of his awakening, Yashamaru repeatedly lost all consciousness as his dark half seized the Yamatai army, carving a horrific trail of carnage through the ranks of traitors and usurpers across Tōhoku. Today, the boy-lord exists in agonizing internal conflict—his shy, blushing demeanor masking the primordial terror coiled within his soul. From his throne of blood, the Earthly Shog
Attributes
Strength
14, modifier 2
Dexterity
16, modifier 3
Constitution
20, modifier 5
Intelligence
12, modifier 1
Wisdom
10, modifier 0
Charisma
18, modifier 4
Actions
Demonic Bite
Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 2d10 + 5 piercing damage.
Veil of Shadows
As a bonus action, Yashamaru can become invisible until the start of his next turn or until he attacks.
Fury of Bontenmaru
Yashamaru can make two attacks with his claws. Each attack deals 2d6 + 5 slashing damage.
Daimyō Command
Yashamaru can grant an ally within 30 feet an additional action on their next turn.
Abilities
Cursed Yamatai Blood
When near starvation, Yashamaru transforms into Bontenmaru, gaining +4 to attack rolls and damage for 1 minute.
Saving throws
strength
5
dexterity
6
constitution
9
charisma
8
Damage resistances
Psychic
Necrotic
Gallery

Public creation
Worldbuilding Context
Yashamaru Yamatai, The Demon Of Tōhoku is a public character profile shared by Bonixthrough Summon Worlds. This view keeps the creator's public information together with clear attribution and links to any connected public Worlds; it does not add story details beyond the fields shown on the profile.
This creation is connected to In Utter Darkness, where its details can support consistent characters, locations, lore, and ongoing storytelling across the wider World.
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