Black Demon Series

The Black Demon Series are the strongest demon weapons because they contain first rank demons. Many of them are aggressive, while others specialize in power amplification and weapon enchantment. Not many people are capable of wielding a Black Demon weapon. Anyone who is a candidate for the Black Demon Series was experimented on, but those are difficult to create. Successful candidates are even more rare.

Demons
There are six that have been named so far:
 * Asuramaru
 * Byakkomaru
 * Gekkouin
 * Kiseki-o
 * Mahiru-no-Yo


 * Raimeiki

Contract Ceremony
A soldier must first choose which weapon he or she prefers the most and step inside the ritual circle. Then the ceremony will start automatically, as soon as he or she lays their hand on the weapon. With contact, the human enters a trance. The soldier and demon battle within the person's mind, and the demon will use painful memories against its host. Once the human convinces the demon to give him/her power, the demon makes a contract. Demons feed off of desire, but they are weakened by love. The human must be careful to have plenty of desire but to be able to reign it in as well, lest the demon take over. The only reason demons form this contracts in the first place is to have an opportunity at stealing their host's body. In return, demons allow their hosts to have immense power.

A host weak in will power will be overcome, and a host without balance will likewise lose control. This is most prone to happening during ceremonies. A demon who possesses its host turns the host into something called a man-eating demon. This demon controls the human's body and attempts to eliminate nearby humans that may cause it trouble.

Advanced Training
After spending a period of time, typically six months, to acclimate to one's Cursed Gear, the bearer can move on to the next stage of training. If the bearer tries this too early, then the demon has greater odds of taking over. Due to the risk of going berserk, this must be done in a location a safe distance from the city or any place important.

First, the bearer activates his/her Cursed Gear to the maximum he/she can currently manage. After doing this, the bearer cuts his/herself and commands the demon to drink his/her blood. The human enters a trance and collapses. This typically takes around twenty hours, and the human may go berserk at any time. The blood loosens the curse binding the demon. Once the human and demon make a serious connection, the human body jolts and shakes. Next, the demon must explain the rules of the human-made curse and contract that holds it prisoner. The curse loosens more. The human and demon wage a mental battle until one submits to the other.

The looser the curse, the greater the power the human can access, but the deeper the demon can dig into the human's heart and have an opportunity of taking over. One way to regain control is to think of one's loved ones.

Manifestation
It’s a state in which the user lets his or her contracted demon come out and be able to use its special power. This drastically reduces the defensive abilities of the host since the demon moves elsewhere. These types of demons work best and different ranges, and the type of ability varies.

This gear has the convenient ability to remain in a smaller, more portable size or manifest into the full-sized weapon at will.

Manifestation-type demons include Byakkomaru, Gekkouin, Shikama Doji, and Tenjiryu.

Possession
Possession-type demons tend to be mean and aggressive. They are more well-balanced for offense and defense than manifestation-types since activating their particular capabilities does not leave their hosts defenseless. They increase the physical strength and power of their user. They are typically limited to close-range combat for melee fighting.

Possession-type demons include Asuramaru, Kiseki-o, Mahiru-no-Yo, and Raimeki.