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The Bladebound's Black Blade "is always a one-handed slashing weapon, a rapier, or a sword cane" and so a monowhip (as a light weapon) doesn't qualify as a valid weapon choice. That said, since your GM is already making the questionable decision to allow technological weapons you might as well ask if they'd be willing to be flexible on this as well. 3 Possible to get a familiar for Unchained Monk without multiclassing?