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It really is down to RNG. Yesterday, 6x earth & 3x moon patrol missions taking out the sword bearer - nothing. Fist of Crota today out of 21 attempts the only drops were black wax idol on attempts 3,10 & 15 I'll see if it drops another time/day.
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Fist or Crota mission and go until you see the first Blade of Crota. Kill him then go to orbit and repeat, until you get the husk from the Blade of Crota.