We are living in an era of mutation and survival. 300 years ago, a sudden mutation transformed the world and expanded the size of the whole planet. The source remains unknown, puzzling scientists to this day. As a result of this mutation, Earth underwent rapid evolution. An unknown energy, later coined as natural energy by scientists, changed Earth's climate, geography, and magnetic fields, causing the evolution. Small animals evolved into colossal beasts, and those that were already big became even more monstrous. The whole ecosystem became a brutal battleground for survival. The forest has become a place for flesh-eating plants and trees. The whole territory was taken over by them. The various fish species in the oceans and seas have evolved into terrifying sea creatures that can rival colossal beasts on the land. These sudden changes in the environment brought death and destruction to the Human Civilization. Some scientists and top influential people managed to save themselves. Yet the masses were affected badly. Over a billion humans died. The Global population plummeted within a few years. Later, the survivors gathered. The top scientists and influential people have built the first safe zone, naming it as a Human Alliance. The scientists then discovered that not only the whole world has changed. Humanity was affected by the mutation as well. Humans initially struggled to adapt to the effects of this mutation. After decades of research, scientists discovered that humans could evolve by bonding with beasts. The mutation has caused several changes among the Beasts. The Regular Beasts, which had no diseases, can bond with the Humans. On the other hand, the Beasts, which had diseases, underwent terrible changes after the mutation. The diseases carried by these Beasts mutated as well. The infected ones are called Corrupted Beasts. Corrupted Beasts spread the disease to other Beasts, infecting them as well. Apart from the Regular Beasts with human intellect, Corrupted Beasts pose a serious threat to humanity. These Corrupted Beasts were driven by their instinct to kill. Not only were they a menace to human society. But they were also targeting the Beasts with human intellect. So it posed a serious challenge to the scientists. After some thorough research, the scientists able to tell the difference between the Regular Beasts and Corrupted ones. The mutation altered human physiology, awakening an evolution by bonding through the Lifeline Beast. Mutation awakened a talent in humans. The Human Alliance as the centre, and the Beast Tamers joined together to create many safe zones thereafter building city infrastructure from scratch. However, conflicts still arise from time to time. There are different camps among the Beasts. Beasts with human intellect have their camps. Some get along with Humans. While others strictly distaste the Human Alliance and view every human on the planet as prey. The Corrupted Beasts live in wild wandering groups and attack whenever they find small human settlements. With all these existing problems, humanity has found a way to march forward. Expanding safe zones one after another in the newly expanded earth with vast land. To track the growth of Beast Tamers and their Lifeline beasts, scientists developed a rank system divided into tiers ranging from Tier 1 to Tier 10. Each Tier consists of 9 Ranks. The Ranks were further divided into Early, Mid, and Peak Stages. So far no Tier above Tier-10 Rank Colossal Beasts was found. ... Note: Similarly, human talent is divided into grades. The current known grades are S, A, B, C, D, E, F Talent Rank - Color: S- Red, A- Gold, B- Blue, C- Green, D- Brown, E- Black and F- White. Lifeline Beasts - Tier-1 to Tier-10. Regular Beasts- Tier-1 to Tier-10 Corrupted Beasts - Tier-1 to Tier-10. Special Beasts: Unknown rank/Bloodline. (Not yet known)