You know, it's silly and I know I should have realized it sooner but "Base Save" is not defined anywhere in the Beta pdf that I could find.
I know, I know. I should have remembered what it was and I finally figured it out but not until after 20 minutes of searching. But I haven't made a 3.x character in a few years, so I was scratching my head for a bit.
Is this defined in the new book? I saw no index in the beta, and I bet with an index I could have figured it out.