Mugen

Mugen(魂の嘆き Tamashī no nageki), more commonly known as the Wailing Soul, it is an ancient sword cursed with a thousand condemned souls sealed within. It is unknown on how Hidetora kentaro got his hands on this powerful mystic blade.

Description
Mugen was once forged by an evil blacksmith, Muramasa, the Blacksmith of Dark Ashes, long ago, who used the black arts and dark magic , and also by using the innocent souls of children , women and warriors as raw materials for forging the blade. He desired for the Ultimate Evil Sword, Hence, Mugen, the Wailing soul was born.

However, Mugen is not entirely an evil weapon, it depends on how its wielder insists on using it, it can be used to save thousands, and it can also be used to kill thousands. It can be used to kill physical beings, as well as Astral beings, such as the likes of demons and such. It has two offensive capabilities, it has the power to extend to nearly limitless lengths,capable to cut through anything with ease. Secondly, it has a hidden ability to open portals to the extradimensional world, the domain of death, Hence, Mugen is the natural enemy weapon to counter those who use the Black arts of Necromancy.

In addition, the sword also possess a healing or reviving ability, by cutting open the portal to the domain of death, one can extract the souls that he wishes from the domain and return it to its original body, Thus, ressurecting the deceased ones. Unfortunately, due to Hidetora's bloodlust, he rarely uses this ability.