It was year 0, the mark of mankind, called Judgement Day, but it was not the coming of God's wrath to execute those who sinned, but the mindless and deadly massacre of all humans.
It had all started with the arrival of a storm of meteors. These were not normal meteors, as they were traveling at far higher speeds as well as being made of a strange material. The surface of the planet of Lunera would soon be impacted by these meteors. Luckily, half of them shot past the planet, avoiding it; however, the other half that were about to hit the earth, unwilling to be shattered upon plummeting through the atmosphere, landed on the land as well as in the sea, creating massive plumes of water and dirt wherever they hit. They did not create craters from their impact however, but instead erected themselves as impressive monoliths that towered over every single living being.
Humans, still ignorant of what was to come, decided to attempt to crack apart these monoliths, but they were unsuccessful as it was harder than diamonds and different than any material known by mankind. Furthermore, they could not determine the type of material nor analyze it as they were unable to take a sample from it.
Soon enough, the lands of Lunera began to sway like boats in heavy storms. It appeared that these projectiles had impacted the ocean floor, causing tectonic plates to break apart and shatter. The plates reformed soon; however, they were not strong enough to prevent the landlasses from tipping over, which caused buildings to topple over.
With the weakness of the new tectonic plates, there became the problem of the circulating magma currents. They brought together all the landmasses that did not have proper support together, and when they met, ground shattering vibrations were sent across the entirety of each of the continents. These separate land masses seemed to congregate around the area in which the monoliths had hit, which soon formed the center of this new land mass which had incorporated every other previous land mass into it.
In the end, the lands of Lunera had stabilized as the land masses reformed its bonds to each other; however, life was just beginning to change. Due to many otherworldly projectiles piercing through the ocean floor as a bullet through paper. These large masses of unknown material soon reached the magma layer, and began to slowly decelerate. As they approached the core, they slowed down more, and all that was moving them was the force of gravity pulling them deeper and deeper into the earth's core. However, this strange material did not melt or conform to the high temperature and pressure at the core. Instead, it sank to the very center of it, creating a strange core that was jagged and had weird protrusions.
A new form of energy soon permeated throughout Lunera. This energy originated from the core, and from the looks of it, this mana was a higher form than the common types of energy, being easily converted to other types of energy such as thermal, kinetic and electric. Not only was the mana emanated from the core though, but relatively small amounts very also released from the monoliths themselves. However, as unstable as it sounded, this mana was able to permeate the earth and the air around it also contained this mana in its original form.
Nobody knew what the world had become, with the endless oceans and new lands to explore. Meanwhile, in the sky, forever distant and long deserted by mankind were hideous creatures capable of soaring the through the clouds, and unchallenged in the air, they stalked the ground hoping to find prey, preferably a human. And on the ground, silently crawling was an army of monsters ranging from no legs, to infinitely many legs as a shape with infinitely many sides turns into a circle; from the softest skin to skin harder than rock; all ready to destroy mankind.
Thankfully, there were also monsters that were not an immediate threat to humanity at the moment. Those monsters were the ones in the oceans, and at the moment were unable to go ashore and wreak havoc as they were still incapable of surviving on land, but as the oceans were larger than the land, they could be a threat in the future.
At the sight of this guillotine to their survival, numerous humans decided to go underground. There, they initiated the construction of massive underground complexes, stocked full of everything they needed to sustain themselves forever as well as tools needed to continue the expansion of these underground complexes. They immediately sealed themselves off from the rest of humanity and braced for the changes that would come. Nothing else was heard from them as the only sign of their existence was soon destroyed by the stampede of beasts and the reclamation of land by nature.
However, it was not only the monsters that had evolved. Humans had evolved too; however, those evolutionary siblings were not at all welcomed by the communities of unevolved humans. They were soon outcast from the previously established country; some died, while others managed to hang on by the one thing they could, hiding.
But no matter how much the humans tried to prevent the outside influences of the world from invading, they were unable to protect all the people from the monsters. Weapons such as machine guns, main battle tanks, or even missiles could only barely kill the weaker monsters. As for the stronger beasts, their weaponry only wounded and injured them, and they soon came back angrier than ever. Their only hope of survival was to flee.
Through the power of the monsters, mankind had been wiped to a mere fraction of its past population. Families, of royalty or peasants, of the rich of the poor, of the powerful or the weak, were about to be killed and exterminated from the world.
But one man rose up, through the newfound knowledge of the monoliths, wiped the monster army. In the end, he had used up his life in a suicidal attack that became the turning point in the war. However, his life before was not forgotten. By spreading the knowledge of the monoliths, which could allow them to gain specialties that could allow them to fight against the monsters, he marked the beginning of mankind to fight and reclaim the world for their own. Although the humans lived on, they were still afraid of the seemingly infinite number monsters and otherworldly beasts, those determined to save mankind rose and were able to refine and spread those techniques through the people to create a new world of Lunera.
With those techniques, they soon established their own country called Aitkon. There, development of their own culture and technology surrounding mana flourished. With the passing of time, the country of elves and dwarves were soon able to be formed as well. Those country themselves, with a common enemy to fight against, were able to come to a non-aggression treaty until the problem of the monsters was solved.
However, the monsters were not just sitting around and waiting to be killed. They had begun fighting among themselves, slowly becoming stronger and stronger as they fed upon the bodies of each other, gathering more and more mana as well as becoming larger. Soon enough, each had established their own territories, unwilling to fight any further, but also keeping an iron grip on each one's territories. These were: the dragon, who lived upon a mountain; the worm, who buried underground; the snake, who slithered around on the ground; and the squid, who shared the oceans with the shark and the whale.
These creatures, keeping each other in check, did not spend any effort trying to take the territories of the humanoids, as they knew once they did, their competitors would take over. Thus, the beasts and the humanoids had been at a stalemate for millenniums.