I can't see it? What I mean to say is that there could be an 80% chance of the Voidfang dropping and a 4% chance for each of the other five pieces dropping.
Those are example numbers, but the method could be the same. There would still be a random number generator, it would only mean that it had a higher chance of hitting the Voidfang Vestments.
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This is very true, well in the post under edit there should be some words about how i didnt take into account that some may be weighed more then others.