Kigetsumon

The Kigetsumon, also known as the Kigetsu Clan, are a sect of assassins and the antagonistic faction alongside the terrorist organization "Testament." They are a society of assassins that have worked in secrecy for 600 years. Naraku belongs to this organization.

History
Towards the end of the Era of War, the Kizuki clan founded the Kigetsumon Assassin's Guild. Over the centuries, the Kigetsu clan have carried out many assassination contracts for those in power, selling their services to those who had the coin. However, towards the dawn of the Tokugawa clan's rule, the leading bloodline, in pursuit of power had cursed themselves with the discovery of the Dark Stone. This stone gave them the power of immense power and strength but also robbed them of their humanity. The curse would go on through the collateral branches.