Firstly, I just want to note that I have a Aasimar grandfathered in and awaiting play, so no need to let me know that they are no longer available in pfs, which would otherwise be a welcome criticism and warning. However, it does mean that I absolutely want to get this character right.
So, like any self respecting Aasimar creator I own the Blood of Angels book. The book makes it clear that Aasimars can be the decent of any intelligent species, and if that species is small, then the Aasimar is then therefore small too.
Now, as soon as I read this, I had a great love and desire to play a fun loving Gnome Aasimar. However, as with much in pfs, especially race, I assume this is way out of bounds and very much not legal.
I also read that everyone says that the Aasimar 'must' be of human decent in pfs, but I can't find where it is written?
I understand why I would not be able to change my size, but I don't understand the issues around playing a different decent, as they are identical to the base Aasimar in every way except ascetically, and I don't know why that would be a problem. Either way, I can't find where is says I can't, for either part (being small, or alternate heritage). So if someone could please help me find what I need I would much appreciate it.
Thank you
p.s. When I talk about Aasimar heritage I am talking strictly about race heritage, such as a Halfling or Elven Aasimar, not things such as Angelkin or Musetouched.