I was exploring my way around Felwinter's Peak, and as a hunter I couldn't help but take envy in the design and model of Shiro's cloak, it looks so cool.
I checked the back and I noticed it's actually made of a bunch of Fallen House of Kings banners. So I'm assuming Shiro has taken out a couple of their ranks, which is pretty admirable considering the King's secrecy.
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I noticed that too. And it has a whole bunch of Fallen digits and symbols because it seems that he only combats the Fallen.