Diablo 2 decrepify vs amplify damage

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I would like to put 18 to 20 skill points into Summon Skeleton Mage (= 8 total magi) for the extra firepower and protection.

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I am not certain if I want to max Corpse Explosion. My fishymancer has maxed Summon Skeleton, Skeleton Mastery, and 17 Corpse Explosion (8-yard radius). Amplify Damage + Corpse Explosion or Dim Vision?