Red Blade

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The Red Blade was a human pirate group operating in Stormheim on the Broken Isles. They were hired by Detheroc disguised as Mathias Shaw to kill Amber Kearnen in exchange for a royal pardon for past crimes but they were turned into vampyr by the vrykul Blood-Thane Lucard.

Speculation
They possessed Red Blade Rum, which might mean that the Red Blade came from Stranglethorn or stole the bottles of a ship from Stranglethorn.