Kurogane

Kurogane (黒鉄, Black Iron) is one of the greatest masterpieces forged by the Immortal Blacksmith, Amakuni Yasutsuna that was made for specifically for Kensei. It is considered to be one of the strongest swords in the world.

Appearance
Kurogane is a black raven katana that has a distinct hamon (刃文, black pattern) that is colored silver, a rectangular black tsuba and has a darkish wrapping around its hilt. Kensei normally keep it inside of a black sheathe that is of a much different shade from its blade. Amakuni states that he forged Kurogane matching the characteristics of Kensei as a swordsman.

Summary
To be added later

Abilities
As one of the greatest masterpieces of Amakuni, Kurogane is an incredible katana unrivaled by any other in the world aside from another one of his others swords. Kurogane has an incredible sharpness has proven capable of cutting apart even magic without damage and has proven durable enough to handle attacks from even legendary weapons such as Durandal without bending in the slightest. As Amakuni prayed to the Shinto Gods throughout it being forged, it is effective against various forms of malevolent entities, he also states that Kensei is still far from bringing out its potential yet he states that Kurogane also recognizes Kensei as its wielder.

Trivia

 * The design for Kurogane is based on Intetsu from Rakudai Kishi no Cavalry.