Apologies if this has been covered elsewhere -- I searched and could only seem to find a thread regarding affects on bats and flying...
Could someone help me in determining some of the relevant stats for my witch's familiar if I wanted to make it a diminutive spider (which I believe would be the proper category for a creature just slightly smaller than the size of a human hand) instead of tiny as I think is listed in the APG? I'm not sure I'm even following the guidelines there for a tiny spider, since it says to refer to the Bestiary and that book only references a medium-sized spider as a template. I'm sure that being a smaller size, the spider would get a penalty to strength, bonus to AC, etc., but are skills affected? I thought about referring to Reduce Person, but figured that an instrinsic, permanent change might need more thought.
If there's a relevant section in the Core Rulebook, Advanced Player's Guide or Ultimate Magic that I'm overlooking, please feel free to point me there and I can use it. Thanks.