Familiars
Source Tech Core pg. 78
Familiars are mystically bonded creatures tied to your magic. Most were originally animals, though becoming a familiar makes them something more. You gain the Pet general feat, except your pet has special abilities. Common choices for familiars include cats, crows, rats, and squoxes. Some familiars are different, usually described in the ability that granted you a familiar. A familiar differs from a basic pet in the following ways.
Modifiers and AC: For Perception, Acrobatics, and Stealth, you can have your familiar use your spellcasting attribute modifier + your level instead of 3 + your level if it's higher. Communication: Your familiar can communicate empathically with you as long as it's within 1 mile of you, sharing emotions. It doesn't understand or speak languages normally, but it can gain speech from a familiar ability.
Familiar and Master Abilities: Instead of choosing two abilities only when you gain your familiar as with a normal pet, you can choose the two abilities each day during your daily preparations. You can choose from familiar abilities and master abilities. You can also choose pet abilities from the Pet feat as familiar abilities. You can't swap out abilities that are innate to your familiar. For example, you couldn't choose not to give a raven familiar flying.
Modifiers and AC: For Perception, Acrobatics, and Stealth, you can have your familiar use your spellcasting attribute modifier + your level instead of 3 + your level if it's higher. Communication: Your familiar can communicate empathically with you as long as it's within 1 mile of you, sharing emotions. It doesn't understand or speak languages normally, but it can gain speech from a familiar ability.
Familiar and Master Abilities: Instead of choosing two abilities only when you gain your familiar as with a normal pet, you can choose the two abilities each day during your daily preparations. You can choose from familiar abilities and master abilities. You can also choose pet abilities from the Pet feat as familiar abilities. You can't swap out abilities that are innate to your familiar. For example, you couldn't choose not to give a raven familiar flying.