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There is a Legacy version here.

Learn a Spell (Trained)

Source Player Core pg. 230
If you're a spellcaster, you can use the skill corresponding to your magical tradition to learn a new spell of that tradition. The Learning a Spell table lists the Price of the materials needed to Learn a Spell of each rank. Learning a Spell is most useful for classes that use a limited list of spells, like the bard, witch, or wizard, though other classes might use it gain rare or uncommon spells.
Item Bonuses for Learn a Spell - Common Items

Item Bonuses for Common items

Ability/SkillItemBonusLevelCategoryConsumable?Note
Learn a SpellEndless Grimoire+16GrimoiresNoChecks to Learn a Spell if you do so by inscribing the spell into the grimoire
Learn a SpellEndless Grimoire (Greater)+210GrimoiresNoChecks to Learn a Spell if you do so by inscribing the spell into the grimoire
Learn a SpellEndless Grimoire (Major)+214GrimoiresNoChecks to Learn a Spell if you do so by inscribing the spell into the grimoire
Learn a SpellEndless Grimoire (True)+318GrimoiresNoChecks to Learn a Spell if you do so by inscribing the spell into the grimoire

Skill Uses

[Arcana] Learn a Spell from the arcane tradition.
[Nature] Learn a Spell from the primal tradition.
[Occultism] Learn a Spell from the occult tradition.
[Religion] Learn a Spell from the divine tradition.

Learn a Spell

Concentrate Exploration 
Source Player Core pg. 230
Requirements You have a spellcasting class feature, and the spell you want to learn is on your magical tradition's spell list
You can gain access to a new spell of your tradition from someone who knows that spell or from magical writing like a spellbook or scroll. If you can cast spells of multiple traditions, you can Learn a Spell of any of those traditions, but you must use the corresponding skill to do so. For example, if you were a cleric with the bard multiclass archetype, you couldn't use Religion to add an occult spell to your bardic spell repertoire.

To learn the spell, you must do the following:
  • Spend 1 hour per spell rank, during which you must remain in conversation with a person who knows the spell or have the magical writing in your possession.
  • Have materials with the Price indicated in the Learning a Spell table.
  • Attempt a skill check for the skill corresponding to your tradition (DC determined by the GM, often close to the DC on the Learning a Spell Table). Uncommon or rare spells have higher DCs; full guidelines for the GM appear on page 52 of GM Core.

Critical Success You expend half the materials and learn the spell.
Success You expend the materials and learn the spell.
Failure You fail to learn the spell but can try again after you gain a level. The materials aren't expended.
Critical Failure As failure, except you expend half the materials.

Table 4-3: Learning a Spell

Spell LevelPriceTypical DC
1st or cantrip2 gp15
2nd6 gp18
3rd16 gp20
4th36 gp23
5th70 gp26
6th140 gp28
7th300 gp31
8th650 gp34
9th1,500 gp36
10th7,000 gp41

Learned Spells

A spell you learn is added to your repository of spells, such as a spellbook for a wizard, familiar for a witch, or spell list for a cleric or druid. If you have a spell repertoire, such as a bard, it's not automatically added since you can only know a limited number of spells. Instead, you can select it when you add or swap spells.