Royal Zodiac Clan Duel Challenge.
A name dull enough that it was easily forgotten. Yet, the simplicity in its name was also a testimony to the straightforwardness of the challenge. A ceremonial duel without any tricks or facades and its sole purpose were to facilitate one condition.
Granting the winner the territory of the loser.
The rules were just as simple as the name implied. The challenger would throw in their animal statue chess piece as a sign of declaration, and the targeted party would have to accept unless they had the backing of another Royal Zodiac Clan willing to block the declaration.
As one of the first ground rules set by the Jade Emperor following the betrayal of the Panda Clan, it was a privilege reserved for direct family members of the Royal Zodiac Clans serving as a sort of legal justification to seize the property of others by betting their own.