Marduk Head was top smn skill piece until AF3, as were Legs, until Oracle came out (which offered the same amount of skill). Up until recently, I was using Skadi Hands for Exenterator (didnt have Thaumas, Myrmex/Athos didnt fall to me, and noone made Sthira Gloves on Carby), and they're still a very strong Exen piece for higher level targets.
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