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The Core isn't for the soft-hearted men of valour...It's for the bloodthirsty.

Episode 12

The Blood Core is the military's most elite group of warriors. While the overseeing commander is Asukai Katsu; Ryusaki Hayate is its head.

The Core is a two-fold branch organization. There is the branch of the Core which deals with the inner workings of the palace and a separate branch which focuses on the outer workings.