Prophecy of Twelve

In a time so old and forgotten there was a prophecy written that 6 siblings would be born two sets of triplets from different mothers, and the same father months apart, 2 boys, one girl from one mother, 2 girls one boy from another mother, the six having the same father. One set would be orphaned at birth, never knowing mother or father and grow up not knowing they had siblings from a different mother and the same father.
The second set would be born motherless, a father who dies by the time they are Five years old. One set was sent to an orphanage as new born infants, the other set sent to the same orphanage five years later. They knew not that either set was their siblings. In their youth both sets learned they had powers they feared to reveal. As things go in the world, there is a balance of Good and Evil. Another two sets of triplets are born, the opposite in misfortune, to know both their mothers and the same father.
They too in their youth learned of their powers, but did not fear them or hide them. They were raised in a household as 6 siblings that were taught to use there powers for ill gain. In time they would be the bane of their Father. It was said that the 12 would meet again and again to decide the fate of the world. Good did not always prevail when they met in battle, and they would be reborn under the same circumstances, while the Evil siblings prospered and the world was ruled by them.
The prophecy says, that when the good siblings are reborn they will once again battle the evil siblings and this time they would be victors and lead the world in a time of peace. The Evil siblings would perish only in time to be reborn again and the battle to rule the earth would repeat itself five times until one wins the sixth and final battle over the other, and the loser would perish never to be reborn again, and Good or Evil would live eternally among the people of the world.
The prophecy has been forgotten as the generations have past. Good as been reborn and died over and over again. Evil has been reborn and died over and over again. The world going from one cycle of prosperity to another, and a cycle of despair and ruin. The final battle is nearing, as the Good 6 find themselves in the same orphanage not knowing both sets are siblings from the same father but different mothers.
They being being the same age, though not knowing they are only a few months apart in age. The infant siblings records sealed and they raised in ignorance of what their last surname is, while the second set of siblings arriving having no knowledge of their surname either being so young when their father died. These two sets of triplets didn't even know they where triplets or siblings, just orphans age 5 at the time our story begins.