Yogaitōgane

Yogaitōgane
The grooves along each blade are made to hold a pair of Ignimarks
Type	Weapon
Material	Molten silk-steel alloy
Origin	Jorogumo-forged relic
Status	Unique; currently wielded by Billy Middleton
Danger Level	Extremely High
Notable Traits	Flame-conductive steel, chain-linked dual blades, bondable Ignimark grooves

Yogaitōgane is a legendary dual-bladed weapon in the SLAY series. It is forged from a rare enchanted alloy known as molten silk-steel — a material born of both jorogumo magic and advanced filament-forging techniques. The weapon's most notable feature is its ability to channel "fire that is not fire," making it uniquely compatible with Billy Middleton's destructive magical abilities.

Overview

Yogaitōgane resembles a reinforced staff at rest, but it splits into two short, curved swords joined by a retractable chain hidden inside the hafts. Its blades are grooved to accept a matching pair of long, wand-like relics known as Ignimarks. These artifacts unlock the weapon’s true destructive potential — though Billy is able to use it in its semi-awakened state thanks to his innate dark flame.

Forging Origin

The weapon was originally forged during the twilight of the Jorogumo Wars by a renegade mage named Tsukirei. Tsukirei specialized in flame magic, a rare affinity among her kind. She designed Yogaitōgane not just as a killing tool, but as a channel — capable of cutting through regenerative flesh and magical wards that resisted conventional fire.

Abilities

• Twin blades linked by a filament-core chain
• Grooves in each blade to insert Ignimarks, which unlock full power
• With or without Ignimarks, the blades can conduct "fire that is not fire"
• Can be used as a staff, dual swords, or whip-like chain weapon
• Burns hot enough to melt magical ice, bypass enchantments, or cauterize on contact

Cursed Inscriptions

Etched into the spine of the chain is the following phrase, only visible under flame: > The heat within binds tighter than steel. Twist it wrong, and you burn.

Hidden Socket Lore

Each blade contains a long, narrow groove — currently empty. The grooves are sized precisely to accept a single Ignimark relic. Ancient texts warn that without these, the weapon remains incomplete and unstable: > That which burns without fire shall awaken the coil. But beware—until the fang is fed, the blade drinks only hope.

Known Wielder

• Billy Middleton — Able to wield the weapon thanks to his innate heat-based power. The grooves remain unfilled.

First Appearance

SLAY Season 3, Episode 91