Handle MoP edge cases

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There are edge cases in the MoP disenchant table, which need to be handled:

Ethereal Shard

*Crafted item level 450 armor set pieces made by Blacksmithing, Tailoring, and Leatherworking will disenchant into Small Ethereal Shard Small Ethereal Shard

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Mysterious Essence

*An exception to the rule is that crafted iLvl 384 bracers only have a 5% chance of disenchanting into Mysterious Essence.

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