Summoner / synthesist saves?

[Grimmzorch]

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So I know when your eidolon is summoned you get the eidolons physical stats. What about the saves? Do you get yours with zthe eidolons stat bonuses or the eidolons with your mental bonuses or the better of the two?

[David Thomassen]

Your Base plus Eidolons Stat for Fort and Ref, Wis for Will.