The Promise was made to Rokugani humankind by all the Kami when they founded the Emerald Empire. After it was sworn, they proceeded with the Tournament of the Kami to decide who would be the Emperor. 
"We will teach you the ways of the world and we will protect you from the evils of the world. Serve us with humility and obedience and we will keep this promise."
Unicorn Clan Edit
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