Secrets how the world changed

The most powerful being in the world, the 10th World Monarch. Overseeing everything in the world like it was in the palm of his hands. But like all great power, a heavy burden came with it. The 10th to succeed grew tired of it all and wanted to lessen the weight he was bearing on his shoulders, to have an easier life, and to have a family. So, he decided to divide the World into Seven Domains and made his trusted Knights become the Domain Monarchs. Each of them becoming the Monarchs of Six of the Seven Domains, with him overseeing only the First. But then a Great Catastrophe occurred, causing the countries of each Domain to converge into one complete landmass. People that had inhuman abilities started to show up as well as creatures of horror pouring out from who knows where. Plunging the whole world into utter chaos after 36 years of peace and prosperity. Everyone looked to the man who was once called the "10th World Monarch", the symbol of authority, for guidance through their intense hardships. However, he was nowhere to be found. All hope was lost. The protagonist of the story, born after the creation of the Domains, saved an "old" man from a dangerous situation that led himself in harm's way. Being in a vegetative state, he was unaware of everything that was happening in the outside world, including The Great Catastrophe. Waking up with the world already in ruins, and people adapted to the changes. The game-like mechanics that only Liu Kai can see will help him throughout his adventures to know the secrets of how the world changed.