samurias are Japanese fighters with kanatas
Samurias fought ninjas. Samurias were part of the Japanese dynasties, and ninjas fought them. It was pretty much for power in the dynasty along with more land.
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The manor had a set of rights between a lord and his serfs. The lord provided his serfs with farmland, protection, and housing. In return serfs farmed the lord's lands, and performed other tasks to maintain the estate. All serfs owed the lord certain duties. That included at least a few days of labor each week and a certain portion of their grain.