Hakumen no Mono

An extremely powerful, golden nine-tailed fox born from ancient times who enjoys destroying countries by manipulating the rulers and creating fear among humans and yokai. Currently, it is trapped in an immense psychic barrier maintained by a lineage of lady shamans under the sea south of Japan. However, this does not keep it completely helpless and plots to destroy the Beast Spear before it finally escapes from its imprisonment.

Each of the nine tails has specific abilities and can spawn various minion yokai and avatars, that can phase through the barrier to do its bidding. The avatars of Hakumen no Mono are some of the strongest monsters ever faced by the protagonists.

Hakumen is over 2000 years old, and currently it's origins is unknown. It thrives on the fear of humans and yokai, and the more fear means Hakumen grows stronger, which is why uit constantly brings terror anduin to countries. Doing so it instills fear among the people, and feeds on it in order to increase its own power. After destroying an empire in China it began to move on to a new country, but during its journey it was attacked by the Beast Spear and found its powers all but useless against the holy weapon. It managed to escape but found itself faced with thousands of Yokai, along with a powerful priestess, Yuki, a reincarnation of Jie Mei, the girl who gave her life to create the Beast Spear. Knowing it was at a disadvantage, Hakumen pretended to retreat in their wake but really it led them to a situation where Yuki was forced to stop the yokai from attacking Hakumen, who had fixed itself into the base of Japan below the sea: If Hakumen was moved from this base, it would collapse and Japan would sink into the sea, destroying every life on it. Yuki created a powerful barrier to imprison Hakumen and keep the Yokai out. And since than, Hakumen has bided its time, awaiting the day it would be free to destroy without limit and bring despair to all once more.

Hakumen is destruction incarnate; it has no qualms with killing, manipulating others into doing its dirty work, it is a sadist in the purest sense of the word, relishing pain and despair in any form, be it physical, mental, or emotional. And of course, Hakumen is extremely intelligent. It is capable of plotting ingenious plans of action, even plans that take years to complete, such as the case when it had one of its avatars, disguised as a human woman, create Kirio to destroy the Beeast Spear for it, and the avatar, without even a drop of remorse, admitted to Kirio, who had always thought of her as his mother, that she had never loved him and that he'd always been nothing more than a pawn of Hakumen, causing Kirio intense emotional trauma. And of course, it manipulated Yuki into saving it from the Yokai by putting Japan in danger.

The one thing that Hakumen fears is the Beast Spear, and it hates the weapon more than anything. As the series progresses, it recognizes the spear's master, Ushio, as well as Tora, to be symbols of hope for both humans and yokai, which is why Hakumen released hordes upon hordes of special demon insects to enter the minds of all those who met Ushio and Tora to erase any memories they have of the boy and the daiyokai, effectively destroying their hope and increasing their despair.