Familiar Form
You transform into a Tiny animal that commonly serves as a spellcaster's familiar. You gain the effects of the spell pest form, heightened to the level of familiar form you cast. However, you can transform into only a bat, cat, raven, snake, or other Tiny animal of a type that you have seen serve as a spellcaster's familiar.
While in this form, despite the restrictions from polymorph battle forms, you retain the ability to cast spells of 1st rank or lower but only those without material components. You still can't make any Strikes or other attacks in pest form, as normal.
Heightened (6th) You retain the ability to cast spells of 2nd rank or lower, rather than 1st, but still only those without material components. Additionally, the duration of familiar form increases to 10 minutes.
Heightened (8th) You retain the ability to cast spells of 3rd rank or lower, rather than 1st, but still only those without material components. Additionally, the duration of familiar form increases to 10 minutes.
Traits
An action with this trait requires a degree of mental concentration and discipline.
Focus spells are a special type of spell attained directly from a branch of study, from a deity, or from another specific source. You can learn focus spells only through special class features or feats, rather than choosing them from a spell list. Furthermore, you cast focus spells using a special pool of Focus Points—you can't prepare a focus spell in a spell slot or use your spell slots to cast focus spells; similarly, you can't spend your Focus Points to cast spells that aren't focus spells.
You must physically manipulate an item or make gestures to use an action with this trait. Creatures without a suitable appendage can't perform actions with this trait. Manipulate actions often trigger reactions.
These effects completely transform the target into a new form. A target can't be under the effect of more than one polymorph at a time. If it comes under the effect of another, the second effect attempts to counteract the first. If it succeeds, it takes effect, and if it fails, the spell has no effect on that target. Any Strikes granted by a polymorph effect are magical. Unless otherwise stated, polymorph spells don't allow the target to take on the appearance of a specific individual creature. If you take on a battle form with a polymorph spell, the special statistics can be adjusted only by circumstance bonuses, status bonuses, and penalties. Unless otherwise noted, the battle form prevents you from casting spells, speaking, and using most manipulate actions that require hands. (If there's doubt about whether you can use an action, the GM decides.) Your gear is absorbed into you; the constant abilities of your gear still function, but you can't activate any items. You lose your Speeds and gain those of the battle form. If a polymorph effect causes you to increase in size, you must have space to expand into or the effect is disrupted.