Promise

The Promise was the oath given by Shiba to Isawa, and which would be followed by Shiba's line.

Tradition
At the dawn of the Empire, Shinsei went to Isawa for aid. Only Isawa had the knowledge to implement Shinsei's plan, and only he had the skill to forever banish Fu Leng, the fallen Kami. But to do this Isawa would have to lay down his life, and the lives of countless kinsfolk and children from his tribe, so he refused. Then the Kami Shiba, a god made mortal, bent his knee to Isawa. He promised that his line would forever serve Isawa's, if only Isawa would follow Shinsei. Isawa agreed. To invoke the Promise was to invoke the covenant between Shiba and Isawa, a promise carried across generations, the right of any who carry Isawa's name.