Raised in the Wildlands on your family's lands, you learned long before your days as a ninja that strength alone protects. The Wildlands are several days away from the central province covered by your feudal lord, and you have learned in this time not to put faith in the protection offered by others. This unusual distance fostered an independent spirit in which the nobility of the Wildlands held mostly to their own laws and customs despite legally being the property of the local feudal lord, Lord Brajenak.
One day, your strength was not enough.
You awoke one morning to a large army that bore neither markings nor devices at the edge of your lands, and you ordered the men while giving the order to evacuate for all who could not fight. In the craggy hills behind the nameless army you saw houses burn and farmland scattered with something... likely salt, so as to destroy your fields. Such raids were common to the Wildlands, but never in this number and never this well-equipped.
With their long experience in these lands, most of your people escaped as the armies clashed around you. You lifted your weapon to charge forward into the throes of war and take back your homeland... and can remember no more. You awoke to see your people scattered and your lands either ablaze or a smoldering ruin. Without your direction, the Wildlands have finally fallen to their invaders.
Overcoming the seriousness of your wounds, starvation, and the harsh Wildlands, you made your way to Lord Brajenak's estate in the central province of Sethir and beseeched him for action on your behalf. Impressed by your resolve and strength, he agreed and asked only that you continue to serve him to the best of your abilities until you were more fully reestablished. You had little choice and accepted his invitation, and after a large meal and treatment for your wounds you were quickly ushered into your new home: A secluded training area several days from the Sethir Province where you learned the ways of ninja and became strong once again.