In the beginning, the Mystic Order are just like every other nobody, their powers come from there individual worlds(yes in this world she shall separate the different cultures/countries into different worlds). In each individuals world they were people of low class, but when confronted by the heartless's power they fought hardest to keep from being consumed, though their efforts be in vain. They awake in the World That Never Was, scattered far across this world, until they find themselves drawn to a certain area,a ruin hidden in a forest hidden deep inside the city, a temple if you will, in which each individual meets at the same time, with a shroud with their respected symbols on them, upon touching these symbols they become infused with the powers of old, which leads them to being who they are, being truly the people that they've always wanted to be, saving those tortured by greed, hatred, sorrow, pain..they are avengers. It is then that they become a secret organization, an Organization of Myths. It's been 1 1/2 years and, although they have the power to do what they once failed to do(save their home world), they are still empty, they want to be whole again, and it is in this that they'll do anything even through away their own beliefs to achieve. It is in these moments that they begin to tarnish themselves, they become consumed with revenge, hatred, only wanting what they can't have...their hearts, and wanting to do anything to achieve such a goal has unfortunately turned them deeper to the darkness.
Trinity, the true seeker of darkness, the true embodiment/master of nothingness...in an ironic twist is the guardian of Kingdom Hearts-which she was given by the keybladers from the past many years ago. This intern gives her even more reason to fight her genocidal & homicidal desires of flooding the universe in nothingness, which in turn destroys everyone & everything on either.
The Mystic Order greatly wants to restore their hearts, and via research and words from the Reverse Order, they are lead directly to Kingdom Hearts. Upon finding Kingdom Hearts, however they are greeted by Trinity, upon which time she allows them not to pass. They ask if she would allow them to become whole again, but the laws of Kingdom Hearts and the instruction of the Keybladers of the past, allow her not to let anyone no matter what the case use Kingdom Hearts, such a pure essence, such a siren existence is meant to be left untampered with, Such is why the Keybladers from the realm of light, darkness, & twilight fought so hard to protect it. Upon hearing such things the Mystic Order begin to argue with Trinity back on forth on what's right, even if it's by law wrong. It is in these moments that Trinity begins to speak on what she feels in her own heart, how she fights such dark temptations everyday, because if she failed to do so everything that we known know what cease to exist. It is then that one of the members becomes enraged-" You don't know what we've been through...you talk all mighty like you know, but you have no idea, your scum, your NOTHING!!..YOU HEAR ME BITCH, YOUR NOTHING!!!"- he charges Trinity without thinking and attempts to strike her, it is in this moment that Trinity stops him in mid attack with her mind, her eyes flash and he turns instantly to nothingness, fading into the atmosphere. The Twins Sexuz & Exdahs (the greek & roman twins), begin to come up with a plan, but their arguing is keeping them from coming up with a plan, their individuality is at stake and each tries desperately to overshadow the other, Trinity of course notices this. They finally decide to attack her and come from each side seemingly as fast as lightening can strike the ground. In and instantly she dodges and appears above them, as she begins to speak. "You two are brothers from blood so shall you be in body, your emotions entwined so shall you be forever"-as the last of her words speak, blood spurts from them both and the two become one in the same body, a loss of individuality. Of course now Meztiso tries to outsmart her with words, by over powering her with thoughts in mind, not brute strength and power. However, Trinity sees through such foolish tactics as she speaks to him- "You pride yourself on being a man of words, being able to out speak others, de-humanize them with your very thoughts spoken in words..as if you can see into their own souls...such pride is overabundant, and must be dealt with...you shall now become those that you despise, now your the fool"-and with that she takes away his ability to speak. As the others look on in horror, One member loses the ability of free will, and will be forever be in a constant of fear, whilst another is given scars over their body, and another is driven mentally unstable, consumed with madness forever.
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It's been 2 years since then and Mystic Organization is still trying to find a way to unlock their hearts. Trinity has disappeared, and Kingdom Hearts itself is has been locked, hidden away so that no one may use it's power to their own will. Though the Mystic Order is unaware of where such a prize is hidden, they've stumbled upon an even bigger treasure...The Exiled Order. They believe that in them they can harness their powers to find & release Kingdom Hearts, because a mysterious member of the Reverse Order told them so. Will they be able to find their hearts and become whole once more, or will they be doomed to fade into nothingness....???