Thanks for the head up. I don't realize cybele has attack and def down skill. Leveling her rn to 60 seems a bother but will try. I'm taking it slowly so leveling her in expert seems valid option.
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That would only be the case if you're focused on one of their elements and don't have plans to use anything else. Also Sniper Shot gives a better reduction than either Belphegor or Cybele.
I mean really, using your logic you could say Ambush does the same since it overlaps with hime def downs.