Hands of Fate
I've seen several people doing variations on the "fantasy series is superimposed on our world" idea during my time on this site, so I decided to give it a shot myself.
The year is 1511, and the Persian Civil War continues to rage on. With the death of the previous emperor in a raid on the palace by barbarians from the west, his sons have torn the nation apart fighting for the throne and have drawn every other nation on the Asian continent into the war, save the Mughal Empire, which has acquired a reputation for being a lazy backwater, and the Khmer Empire, which is far too reclusive to get involved in any such affairs on the continent. However, Khmer did give the rest of Asia a "prophecy" of sorts: five children, one Khmer, one Tibetan, one Zhongguan, one Nipponese, and one Persian, all born during an eclipse, will bring the Persian Civil War to an end. These five teenagers, who are currently being raised beneath the western mountains of Tibet by an organization called the Hands of Fate, do in fact exist. However, there is already a flaw in the plan: the Tibetan infant was killed by Persian soldiers when the Hands of Fate attempted to retrieve it, and with no other Tibetan children having been born during the eclipse, they had no choice but to replace it with a child from the Mughal Empire. Furthermore, the five children are hardly happy with the "destiny" that has been laid out before them, and the fact that they've been trapped in a cave for most of their lives by the Hands of Fate hasn't helped matters. Instead, they mainly want to be reunited with their families, with ending the war only being a secondary priority for them, especially given that none of the emperor's three sons are particularly appealing choices to ascend to the throne.
From the bloodthirsty ruler of Tibet, to the overprotective queen of Nippon, to the disorder of the Mughal Empire, to the dark northern islands where the Khmer Empire now resides, to the divided land of Persia, the five children from across the continent certainly aren't going to have an easy time accomplishing any of their goals. And as it becomes clear just how much the Khmer Empire's leaders are involved in manipulating events across the continent, their hopes and dreams are going to become a lot harder to achieve.
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