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The best, and most practical trio, if you had to pick only 3, would be WI, WA, and FB.

FB hard luck, enervation, and -defense from synergies, help a lot more than FA buffs and individual FA dps...

WI allows for smaller parties though, and generally faster runs. You can do with 6 sp in a large party. In a smaller party, that'd be pretty difficult, and would take longer too.

WA and FB