Kitsune Synthesist Summoner and Fox shape

[lucien pyrus]

Does fox shape work while your eidolon is summoned? Does it change the eidolon to a tiny creature or does it stay the same size?

I'm just unsure about it.

[Avianfoo]

1) The eidolon skin is not a polymorph effect. Think of it like wearing armor because that is in effect what it is. So they do work together.

2) The eidolon remains in its original size, with a tiny fox hovering somewhere in the middle.