Royal Guard's Claymore

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Royal Guard's Claymores are one of the weapons stronger than the upgraded Master Sword, the others including the Ancient Battle Axe++, and the Savage Lynel Crusher. These weapons have high damage, but low durability. These are part of the Royal Guard's Series, that include the Royal Guard's Sword, Royal Guard's Spear, and the Royal Guard's Shield.

Location and Uses
You can find this Claymore in Hyrule Castle's armory, and also in the hands of Black Moblins, somewhere close to the Armory room. Royal Guard's Claymore can also be traded to Parcy, for an Ruby. You can do a glitch, to get infinite rubies, when Parcy takes your Claymore, it still shows in your inventory.