The "Bestiary Familiars" option is free to all users, but for the cases where the core rulebook only identifies the bonus that familiar gives, but does not give the stats you would need to know the AC or attacks for that familiar, we decided to put those inside a source, so that GMs had the option to forbid them. However, most people using a "core-only" campaign should not turn this setting off - most GMs would consider that to be closely related to CRB content.
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