Hidden by the mountains in a valley called the valley of souls, was the city Aurora were a group of Spirits and people lived. The people there lived in houses of stone decorated with inscription of the language, their clothes was beautifully embroidered with colours and designs. It was a very happy and prosperous place, booming natural beauty and untouched resources.
The People had a special relationship with the spirits. Which started ages ago when spirits ran ramped in world and evil spirits would try harmed and destroyed humanity. This was called the age of despair, humanity was almost wiped out, but thanks to the spirits that ally with them, they were able to defeat and seal the evil spirits away in the spirit world. They close travel between the spirit and human realm, travel is done by via spiritual mediums.
The disconnection between the realms cause amount spirits on earth to decrease immensely. After time most humans forgot about spirits and became unaware of their presence, spirits became but that of fables in the minds of men. But a few descendants of the warriors that fought in the age of chaos remembered, they established Aurora in the valley of souls as symbol of their unity. They created mediums, giant totems inscribed with ancient text and beautiful blue gem that medians for connecting with souls through realms. They put them all over the city So spirits may travel freely from the spirit realm. The people would hold annual celebration events in remembrance of the friendship between spirit and man. Spirits and human would partner together to in a duel to display their bonds in friendly competition of skill and power. Fighting idea by side like how they fought as in the age of despair.
One the most revered spirits was the four heavenly dragon, Odd eyes dragon, Dark rebellion xyz dragon, Clear wing synchro dragon, and Starving venom fusion dragon. Victory would been unattainable during the age of despair if wasn't for their strength. Though all are as strong as they, every spirit have pride in their abilities, just a the people of Aurora have pride in who they are.