Originally Posted by
Thorny
Have you done Dyna-Xarc? The NMs each drop their own piece, never any other piece. The droprate isn't notably higher than a random mob, the piece is just isolated. IE: Normal mob has a 10% chance of dropping a piece. If that piece drops, there's a 1/20 chance it's RDM. That gives you a net droprate of 1/200 or 0.5%. Duke Berith has a 10% chance of dropping a piece. If that piece drops, it's RDM. That gives you a net droprate of 10%.
I hope this made it clear, 10% is not the actual droprate, only used for illustration.