"Magic resides in the souls"
Soul Crystals are the source of magical power for humans. Those who are born with a soul crystal can use a specific kind of magic, depending on the attribute of their crystal. The crystal resides inside a person's heart and can be seen when it shines - the light emitted from the heart surrounds the host and takes the visible form of a pendant.
All power comes from the primordial elements, the ones that built the world. Only those 9 are the perfect and supreme powers - true magic.
The other magic powers are just combinations between them, unable to have much magical force.
Soul Crystals were gifted to humans by Auras - magic particles with a mind of their own that created everything, they are 9 distinct types, each corresponding to one Element - at some point in time for them to protect themselves. In the past, when humans were created, they were so weak, small, and fragile, unable to defend themselves from the giant creatures that roamed freely everywhere on the surface of the planet.
When the planet was near to reach its end and the Nucleus became unstable, 2 links made by magic with nearby planets served as a source of power for the Nucleus.
The Auras got upset that humans were stealing the force of other planets to keep their egoistic lives going. The humans were hated by their creators. The Auras became dark around those with bad, cunning souls, they started to feel pain, many died, and those who survived started to change their body, to embrace the darkness and not be swallowed by it, and those who stood ferm against it were changed. To counter the evil survivors of the "curse", Auras chose good hearted humans to be blessed with enormous mana and hunt the evil doers.
And so, Himei (demon) and Reiten (angel) races were born from the creatures once humans. The new races could not live together with humans on the same planet due to their bodies stealing life force around them, so they were banished to the linked planets and served under the other 2 Myths that chose to protect and guide them.
Using the portals that formed where the links were made, they crossed bridges to new worlds. The Himei were selfish creatures and wanted all for themselves, so they chose a new evil Protector and tried to conquer human and Reiten worlds to make them obey their power. To avoid this, seals were put at the bridges that linked the worlds together. No one could pass through nor break them, the magic that sustained the seals was coming right from the Nucleus of each planet. As long as the planets were alive, the seals would be untouchable too.
After that, the remaining 2 Mythical Protectors have forbidden travel between worlds and hidden the space-time spells in the Center of the Planet so that no one can learn it again.
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100 years ago
After a few decades of separation between worlds and peace, portals started appearing in random places by themselves (different colored portals: blue takes to the Himei, white takes to Reiten, yellow takes to Human world). The three worlds were always connected from the moment they were linked, the complete isolation was impossible.
When Himei found the portals, they started to come and attack Humans. To counter the attacks, the King and Queen of Kingdom Solis – the largest of the 3 kingdoms – formed The Teams: they gathered only people with powers of primordial elements, split them into 7 groups (each made of 10 people), and helped them achieve greater magical power so that they would be able to defeat Himei invaders.
They named each team by the initials of their captains: First Team I, Second Team V, Third Team X, Forth team L, Fifth team C, sixth Team D, and Seventh Team M.
The most important teams, whose Captains sat by the left and the right side of the throne were Team I and Team X. They have been always the pride of the throne.
Himei came to invade human lands with a large army once they found it their Protector was no longer there. A great war that lasted for many years occurred. But after Himei sank into the ocean the Kingdom Luna got drunk into their victory and marched towards Kingdom Solis.
King of Solis searched for help from the 10 Noble clans: Aizawa, Mizuki, Toriya, Hoshira, Fujiwara, Setsushi, Oshiro, Yamatani, Namizaki, and Hideyuki.
With the Clans and the Teams and even The King himself on the front lines, Kingdom Solis crushed the Himei army in less than a year.
The King resorted to the final weapon he could use to stop Himei: the Phoenix Crystal – the legacy of the Protector of humans, who was also the founder of Kingdom Solis.
Once the Himei were suppressed and the portals sealed, peace returned in the Kingdoms and the legend of the powerful Phoenix Crystal used by the brave King of Solis has begun spreading into the world.