You will Drop Ultimate Versions of the Guardian/Historic/Angel/Legendary Golden - Weapons at the 4 Different Rangda Witches all over Madrigal.
You can use Flyff Wiki to find the official Flyff Rangda locations at the Links below.

Rangda also drops Black Diamond Pieces.


Rangda (Guardian Weapons)

Horrible Rangda (Historic Weapons)

Uncanny Rangda (Angel Weapons)

Dreadfull Rangda (Legendary Golden Weapons)