This reduces the elemental affinity of the mob to even... thus allowing your spells to do more damage as they don't have elements in place to mitigate the damage caused by nuking spells and the like
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FFXIV (Fabul Server) Co-Lead of the Kupo Knights LS Mocarth Dawgwylf Conjurer & Blacksmith Fruvix Dawgwylf Marauder, Tradeskills Unknown