Remnant
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Since the birth of the first Koberu all have been blessed with Nak Tal's Life Force, or as the Koberu call it ''Mother's Embrace'' this embrace is known as Remnant.

Remnant is the core of every Koberu, it is the reason they are able to, well do what they do, that includes shapeshifting, magical abilities, and much more!
if a Koberu were to ever loose its Remnant he or she would fall ill, and after a short while will die...

As you may know, Ancients and Koberu are indeed the same, BUT Ancients are more powerful and more adept at their abilities and are not born with a set base element, while some prefer to stick to one element they are able to learn all and us and mimic any ablility they come across (must have contact with said ability or person using the ability)

An Ancient's Remnant is more potent and more active then a standard Koberu's Remnant, which is what resulted in the Great War of Korvaran, Allow me to explain...

The Great War
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After 1000 years the Ancients broke off from their lesser cousins the Koberu, years of breeding resulted in subspecies being created, you are well aware of these subspiecies Mushoku, Bura, Gorudo, Akakido, Nichi, Shikuro, Kujaku, Kudoken, Majo, rose, yuki, and sakino, which each have an ''ancestor'' who started the subspecies, after a while, the Sub species became disconnected from the Ancients and no longer share the same blood but blood of their own.

Now they still are related, but just do not share the same bloodline anymore, there for the sub species are not ''Pure'' which is why their Remnant is not the same,
an Ancient's Remnant is so potent is is able to restore life to anyone, but at the cost of the host sacrificing themselves, not only can it revive a single life, it is able to be used as an energy source, and that is where D.E.L.T.A comes in...

D.E.L.T.A if you are not aware, are an organization who are on an ''mission'' to help save the wildlife from destruction, but in reality, they mean to control the system by turning anything living into bio weapons, (they are also responsible for Radio's Parents being killed and her species nearly being wiped out) D.E.L.T.A discovered Korvaran and its inhabitants and managed to capture an Ancient, they extracted the Remnant from the Ancient but found out that the Ancient passed away shortly after, but their Remnant was able to super power their mechs, weapons and helped empowered their bio weapons, therefore they sought out the rest of the Ancients, capturing them and forcing them to breed and produce more, they at first tried to extract the Remnant once they were born but, found it was not as affective as when they are adults.
after years of abuse and torment, the Ancients begin to fight back, even their cousins joined the battle as well as their sworn enemies the Kyrasifs, leading the battle were 12 Ancients, and these 12 are the ones who started each of the sub species, all but 5 remained after the fight, but they managed to win the war and drive D.E.L.T.A back...for now.

Rela, Orion, Phantom, Revnant and Ignitus are the last remaining Ancients, (this is the reason why i do not allow the creation of Ancients or allow people to get them as customs UNLESS its through auctions)