Sword of Kings

This takes place in a fantasy world, Armaynia, where a magical crystal called "Prisminium" appeared in the continent of Saphera, many human nations of Saphera see Prisminium as a "gift from the Gods" or "Bringer of civilization" as many human nations begin to use Prisminium for magical advancements, rejecting it, or... Industrializing it, one nation, the Giyanite Empire of Giyan was driven by ambitions, greatness and greed, they used it to make the first synthetic light or "light bulb" and fully powered steam tanks, but this has other human nations to start rapid expansion and securing more Prisminium veins, for if a single small shard was left unexpected for several weeks it will be grow back to a new vein, giving every single nations unlimited access to power, but Tycion, a unifying nation who sees non-humans as a drive to human civilization tries to minimize the use of Prisminium because of its properties related to magic, but soon, 7 human nations, the Giyanite Empire, the Household of Peistoria, the Demacies Enclave, the Republic of Kurasnar, the Principality of Janaria, the Union of Nakrac, and the Bosnian Empire broke into a war the has never seen, a war with not just infantry and Knights, but with towering war machines, Steam powered Tanks, and flying Airships, it is known as the "Pendulum War" where the 7 human nations try to steal or secure more Prisminium veins for their own nation, but the war lasted for 100 years resulting in the destruction of Tycion, and millions upon millions of soldiers died on all sides, eventually at the war came to an end by the time of the arrival of the "Overseers" beings from a unknown origins, eventually at the seven nations formed a ceasefire and director remaining forces to face against the Overseers. The year is 140 Post Casum (or 140 P.C) where Pioneers travel to the continent of Lycona, where new places, new culture, and new nations, await for them, and thou shall brave these new adventures.