In the second era under the Empire of Cinoh, the first Aomoya emperor had four legendary royal guards, who each wielded a unique elemental weapon. Kurokasai is a part of this set of the Aomoya Elemental Guardians.
Kurokasai was forged by an oniling named Kagegojuu Kishi. After him, it passed through countless generations of the Kagegojuu family. When the family took over the country and formed the Kagegojuu Shogunate, the katana became a symbol of the Shōgun's family and was passed down from Shōgun to Shōgun.
The Black-Fire Katana belongs to Kagegojuu Aite in the modern day. In 3E466, she lended it for display to the Art Museum in Ammba for a few years.
martial melee weapon, 1d8 slashing, versatile (1d10), longsword, legendary (requires attunement by a spellcaster)
A blade of black fire, this katana has been awakened to a part of its old power. You have a +1 bonus to attack and damage rolls made with this magic weapon. On a hit, the weapon does an extra 1d6 fire damage. You can use this blade as a spellcasting focus.
Fireball. While attuned, you can use an action to cast fireball at 3rd level, using your spell save DC or 11, whichever is higher. This feature of the sword can't be used again until the next dawn.
Black Flame. Fire damage done by the blade ignores resistance to fire damage, and treats immunity as if it were resistance. Additionally, while attuned to the blade, you gain resistance to fire damage.
Versatile. This weapon can be used with one or two hands. A damage value in parentheses appears with the property—the damage when the weapon is used with two hands to make a melee attack. (1d8 one handed, 1d10 two handed but you lose out on the duelist bonus)
martial melee weapon, 1d8 slashing, versatile (1d10), longsword, legendary (requires attunement by a spellcaster)
A blade of black fire, this katana has been awakened to its former power. You gain a +2 bonus to attack and damage rolls made with this magic weapon. On a hit, the weapon does an extra 2d6 fire damage. You can use this blade as a spellcasting focus.
Fireball. While attuned, you can use an action to cast fireball at 3rd level, using your spell save DC or 13, whichever is higher. This feature of the sword can't be used again until the next dawn.
Black Flame. Fire damage done by the blade ignores resistance to fire damage, and treats immunity as if it were resistance. Additionally, while attuned to the blade, you gain resistance to fire damage.
Versatile. This weapon can be used with one or two hands. A damage value in parentheses appears with the property—the damage when the weapon is used with two hands to make a melee attack.
martial melee weapon, 1d8 slashing, versatile (1d10), longsword, legendary (requires attunement by a spellcaster)
A blade of black fire, this katana has been returned to its original legendary power and has been strengthened even beyond its original bounds. You gain a +3 bonus to attack and damage rolls made with this magic weapon. On a hit, the weapon does an extra 3d6 fire damage. You can use this blade as a spellcasting focus.
Firestorm. While attuned, you can use an action to cast firestorm at 7th level, using your spell save DC or 18, whichever is higher. This feature of the sword can't be used again until the next dawn.
Black Flame. Fire damage done by the blade ignores resistance to fire damage, and treats immunity as if it were resistance. Additionally, while attuned to the blade, you gain immunity to fire damage.
Versatile. This weapon can be used with one or two hands. A damage value in parentheses appears with the property—the damage when the weapon is used with two hands to make a melee attack.