Born in a fleeting moment of stability amid the turbulence of space and time, Jixu is indeed immortal and indestructible. But that doesn't mean they are a heartless being. They possess the same seven emotions and six desires as humans.
And so, they and several other gods created a world near the turbulence of space and time...
Eventually, they were the only one left in that world.
Immortality and indestructibility had instead become a torment. After the thought of destroying the world came to them one day, they chose a way to keep themselves from actually doing it: they sealed their mind in the state of a young child.
As time passed, the childlike Jixu went too far while playing around one day, and for some unknown reason lost their divine power. At the brink of life and death, they briefly managed to use their power again and escaped to the territory of the vampires…