User blog comment:ChishioKunrin/Grimm-mask Samurai Woman = Yang's Mother/@comment-24174284-20141024135312/@comment-10390252-20141024135843

I'd think to have multiple actual blades in the sheath would be heavy and cumbersome. My guess is that its a charger that slides a dust core into the centre of a hollow blade that then 'charges up' with that Dust's effect.