The traveler stumbled the void and wants to merge all dimensions but he got stop by the 4 kings of the dimension and got sealed. As time went on, the planet earth found a way to travel into the other dimension but they didn't know, that void king was sealed and escape to their dimension. So both scientist Jayce and Kate the parents of Ruijin stopped the void king by using the device that have the copy power of the current rulers of the dimensions with the help of the current rulers. They sealed him again, 10 years later it's all happening again