The disks were an attempt by the Quincy's to copy the Soul Reapers Zanpakutō but they were considered failures, for two reasons.

The first one is that no one could figure out how to create a soul or imprint their souls into them to create the spirit that would live in the sword.

The second reason is that they were incomplete, the disks themselves aren't a finished product, so a person needs to use two of them to make them work properly.

Not to mention that they don't offer the user anything except the spirits of the dead Quincy and a pair of swords.

It's believed that Kazuma has some sort of connection to the spirits of the Quincy and he's the reason why their souls\ spirits are now showing up inside the disks but no one truly knows why.

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All of that was a problem until Kazuma showed up and filled in the blanks.

The reason is that Kazuma can use the disks like the Adventurer Skill Cards.

Meaning that if Kazuma or someone he has given a pair of disks to, gives someone else a pair of disks, then that person can learn whatever power they want.

If the person that gave them the disks likes them enough, then they can just let that person copy whatever skill they like from them.

There's also the limit to how much power a person can control because if you're weaker than the person whose skill\ power you copied then the skill\ power will be weaker than its original user.

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Kazuma's new skill;

Sacred Resureccion, The goddesses gave Kazuma this skill because they know how easily he dies.

Unfortunately because of how many times Kazuma has seen Aqua and Eris resurrect him and other people, he has no idea how other people see him when he does this, nor does he care because it's the spirit world and everyone is already dead.

This skill doesn't just bring him back to life, the guy can bring other people back regardless of who they are and how long they have been dead as long as their souls and spirits are present.

This skill has the same limit it had when Aqua was with Kazuma. There has to be something left to bring the person back.

It can be as small as a single hair, as long as something is left he can bring the person back.

[Yes it works on flesh and blood Humans too.]

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Disk spin; allows the spirits in the disks to fight alongside their users, meaning that they can fire arrows and use whatever skills they have to help their users during a fight.

The spirits aren't limited to whatever power that had, they can access the skills that their disks copied and create their own combinations with them however, they do get weaker if the fight drags on.

The reason is that they aren't connected to their user anymore, they are fighting separately from them in this form.

[Doble calibre] the same as before but the user is now directly connected to the disks granting him the spirit's skills and granting the spirits access to their user's energy.

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The Supernatural Combat Club\ The Adventurers;

The Supernatural Combat Club also Known as the Adventurers was and is nothing more than something Kazuma created to pass the time.

It just happens to be filled with people that can see ghosts and either have powers of their own or disks that Kazuma gave them so that they can fight said ghosts.

The group also has several people that are ghosts who joined the group because they thought it would be interesting, were forced to join or joined the group when they were at a low point in their lives and haven't left ever since.

Contrary to popular belief the group isn't a threat to anyone despite what many claim, as its members keep to themselves and are usually training or simply living their lives.

The group calls itself the Adventurers as they have entered the various realms and explore the areas that no one else dares to enter, it's these areas where they pass their time training.