So the Synthesist is a weird blend of the eidolon and the summoner. It uses the E's physical stats and the summoner's mental stats.
Does the description spcifically mention how to handle saves? The summoner and E can have different good/bad saves.
Do you use the Summoner's saves - with REF and Fort adjusted by the E's ability scores? That seems the easiest to me.
So the Synthesist is a weird blend of the eidolon and the summoner. It uses the E's physical stats and the summoner's mental stats.
Does the description spcifically mention how to handle saves? The summoner and E can have different good/bad saves.
Do you use the Summoner's saves - with REF and Fort adjusted by the E's ability scores? That seems the easiest to me.
It doesn't mention anything about saves, so your assumption is correct. Your base saves as a summoner, modified by your replaced Dex and Con and your natural Wis.