Player Core
Chapter 7: Spells
Focus Spells
Source Player Core pg. 296
Focus spells are a special type of spell attained directly from a specific source, such as a field of study, connection to a mystical force, or exposure to an alternate reality. 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. Even some classes that don't normally grant spellcasting can grant focus spells. The title of a focus spell's stat block says “Focus” instead of “Spell”, and the spell has the focus trait.
Focus spells are automatically heightened to half your level rounded up, just like cantrips are. You can't cast a focus spell if its minimum rank is greater than half your level rounded up, even if you somehow gain access to it.
Casting any of your focus spells costs you 1 Focus Point. You automatically gain a focus pool the first time you gain an ability that gives you a focus spell. The maximum number of points in your pool is equal to the number of focus spells you know or 3, whichever is lower. This counts only spells that require Focus Points to cast.
You replenish all the Focus Points in your pool during your daily preparations. You can also use the Refocus activity to pray, study, meditate, or otherwise reattune yourself to the source of your focus magic and regain 1 Focus Point. You can Refocus multiple times to regain multiple points, up to your pool's maximum.
Focus spells are automatically heightened to half your level rounded up, just like cantrips are. You can't cast a focus spell if its minimum rank is greater than half your level rounded up, even if you somehow gain access to it.
Casting any of your focus spells costs you 1 Focus Point. You automatically gain a focus pool the first time you gain an ability that gives you a focus spell. The maximum number of points in your pool is equal to the number of focus spells you know or 3, whichever is lower. This counts only spells that require Focus Points to cast.
You replenish all the Focus Points in your pool during your daily preparations. You can also use the Refocus activity to pray, study, meditate, or otherwise reattune yourself to the source of your focus magic and regain 1 Focus Point. You can Refocus multiple times to regain multiple points, up to your pool's maximum.
Spellcasters with Focus Spells
Source Player Core pg. 296
If you are a spellcaster, your focus spells are the same tradition of spell as the class that gave you the focus spell. A mystic's are determined by their connection, and a witchwarper's are determined by their paradox.
Non-Spellcasters with Focus Spells
Source Player Core pg. 297
If you get focus spells from a class or other source that doesn't grant spellcasting ability, the ability that gives you focus spells also provides your proficiency for your spell attack modifier and spell DC, as well as the magical tradition of your focus spells. Though you can cast your focus spells, you don't qualify for feats and other rules that require you to be a spellcaster or have a spellcasting class feature—those require you to have spell slots.
Focus Points from Multiple Sources
Source Player Core pg. 297
It's possible, especially through archetypes, to gain focus spells from more than one source. If this happens, you have just one focus pool, counting all your focus spells to determine the points in your pool. You can spend any of your Focus Points on any of your focus spells. Likewise, when you Refocus, you get back a point as long as you follow the guidelines of any abilities that granted you focus spells. Having Focus Points from multiple sources doesn't change the tradition of your spells; if you had both healing epiphany spells and precog warp spells, your mystic spells would remain divine and the witchwarper spells occult. Similarly, you need to use the attribute modifier determined by the source of the focus spell.