General Skills
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There is a Legacy version here.

Recall Knowledge (Untrained)

Source Player Core pg. 231
To remember useful information on a topic, you can attempt to Recall Knowledge. This action is one you're likely to use frequently. Learning more about the world and people around you is one of the best ways to inform your decisions, and Recalling Knowledge can help you figure out how to best fight monsters and figure out puzzles and social challenges.

You might know basic information about something without needing to attempt a check, but Recall Knowledge requires you to stop and think for a moment so you can recollect more specific facts and apply them. You might even need to spend time investigating first. For instance, to use Medicine to learn the cause of death, you might need to conduct a forensic examination before attempting to Recall Knowledge.
Item Bonuses for Recall Knowledge - Common Items

Item Bonuses for Common items

Recall KnowledgeCodex of Unimpeded Sight (Greater)+112GrimoiresNo
Recall KnowledgeCinnamon Seers+14Alchemical FoodYesChecks to Recall Knowledge
Recall KnowledgeInsight Coffee (Lesser)+26Alchemical FoodYesRecall Knowledge with a skill determined by the blend chosen when the item is crafted (Religion, Nature, Arcana, Society, Occultism, Medicine)
Recall KnowledgeDiadem of Intellect+317Other Worn ItemsNo
Recall KnowledgeArtificer Spectacles+317Other Worn ItemsNo
Recall KnowledgeWhispering Staff+320StavesNo
Recall KnowledgeInsight Coffee (Moderate)+312Alchemical FoodYesRecall Knowledge with a skill determined by the blend chosen when the item is crafted (Religion, Nature, Arcana, Society, Occultism, Medicine)
Recall KnowledgeInsight Coffee (Greater)+419Alchemical FoodYesRecall Knowledge with a skill determined by the blend chosen when the item is crafted (Religion, Nature, Arcana, Society, Occultism, Medicine)

Item Bonuses for Uncommon/Rare/Unique items

Recall KnowledgeScholarly Journal+13Adventuring GearNoRecall Knowledge about the subject
Recall KnowledgeSurvey Map+13Adventuring GearNoSkill checks to Recall Knowledge, provided the checks are related to the location detailed on the map
Recall KnowledgeSurvey Map (Atlas)+13Adventuring GearNoSkill checks to Recall Knowledge, provided the checks are related to the location detailed on the map
Recall KnowledgeHoax-Hunter's Kit+13Adventuring GearNoRecall Knowledge about a creature you are studying
Recall KnowledgeWatch of Lost Ages+13Relic SeedsNoRecall Knowledge about historical subjects
Recall KnowledgeExploration Lens (Investigating)+112Held ItemsNoChecks to Recall Knowledge while Investigating

Skill Uses

[Arcana] Recall Knowledge about arcane theories; magic traditions; creatures of arcane significance (like constructs, beasts, and elementals); and the Astral Plane, Elemental Planes, and the Netherworld.
[Crafting] Recall Knowledge about alchemical reactions, the value of items, engineering, unusual materials, and alchemical or mechanical creatures. The GM determines which creatures this applies to, but it usually includes constructs.
[Lore] Recall Knowledge about the subject of the Lore skill's subcategory.
[Medicine] Recall Knowledge about diseases, injuries, poisons, and other ailments. You can use this to perform forensic examinations if you spend 10 minutes (or more, as determined by the GM) checking for evidence such as wound patterns. This is most useful when determining how a body was injured or killed.
[Nature] Recall Knowledge about fauna, flora, geography, weather, the environment, creatures of natural origin (like animals, beasts, fey, and plants), the First World, and the Elemental Planes.
[Occultism] Recall Knowledge about ancient mysteries; obscure philosophies; creatures of occult significance (like aberrations, spirits, and oozes); and esoteric planes like the Astral Plane, Creation's Forge, the Ethereal Plane, the Netherworld, and the Void.
[Religion] Recall Knowledge about divine agents, the finer points of theology, obscure myths regarding a faith, and creatures of religious significance (like celestials, fiends, and undead), Creation's Forge, the Void, and the Outer Sphere.
[Society] Recall Knowledge about local history, important personalities, legal institutions, societal structure, and humanoid cultures. The GM might allow Society to apply to other creatures that are major elements of society in your region, such as the draconic nobility in a kingdom of humans ruled by dragons.

Recall Knowledge [one-action]

Concentrate Secret 
Source Player Core pg. 231
You attempt a skill check to try to remember a bit of knowledge regarding a topic related to that skill. Suggest which skill you'd like to use and ask the GM one question. The GM determines the DC. You might need to collaborate with the GM to narrow down the question or skills, and you can decide not to Recall Knowledge before committing to the action if you can't don't like your options.

Critical Success You recall the knowledge accurately. The GM answers your question truthfully and either tells you additional information or context, or answers one followup question.
Success You recall the knowledge accurately. The GM answers your question truthfully.
Critical Failure You recall incorrect information. The GM answers your question falsely (or decides to give you no information, as on a failure).

Sample Recall Knowledge Tasks

These examples use Society or Religion.
Untrained name of a ruler, key noble, or major deity
Trained line of succession for a major noble family, core doctrines of a major deity
Expert genealogy of a minor noble, teachings of an ancient priest
Master hierarchy of a genie noble court, major extraplanar temples of a deity
Legendary existence of a long-lost noble heir, secret doctrines of a religion

Recall Knowledge Questions

When encountering a subject for the first time, your first question will likely be a basic “What is it?”, which the GM can answer with a name and basic description like, “That's an ogre, a tough and cruel giant” or “This is the symbol of Urgathoa, a goddess of disease, gluttony, and undeath.” If you already know this base level of detail on the subject, the list below includes some reasonable questions. The GM determines what other questions to allow. Usually this is simple as long as you stick to one question. Any question must be about something observable in the game world, not the abstract numbers of the rules. The GM might tell you a lumbering monster's Reflex save is its weakest—translating a concept your character could understand using the game term for clarity—but wouldn't reveal the exact Reflex modifier. The GM can find more guidance in GM Core.

Creatures: “Can it be reasoned with?” “What environments does it live in?” “What's its most notable offensive ability?” “Is it highly vulnerable or resistant to anything?” “Are any of its defenses weak?”

Magic: “How can it be avoided?” “What type of people use this magic?” “How long does it last?”

Organizations: “What kind of influence does it have?” “Where is it headquartered?” “How large is it?” “What kind of members does it have?” “Who are its major authorities?” “Do they have any notable allies and enemies?”

People: “What's their personality like?” “What do they look like?” “Do they have any notable talents?” “Do they have notable allies and enemies?” “What kind of influence do they have?” “Do they have any vices?”

Sites: “What's its general location?” “How large is it?” “What's the government like?” “Do any notable people live there?” “What kind of monsters dwell there?” “What's the environment and terrain like?”

Recall Knowledge Skills

The following skills can be used to Recall Knowledge about the listed topics. Some topics might appear on multiple lists, but the skills could give different information. For example, Arcana might tell you about the magical defenses of a construct, whereas Crafting could tell you about its sturdy resistance to physical attacks.

  • Arcana: Arcane theories, magical traditions, creatures of arcane significance, and arcane planes.
  • Crafting: Alchemical reactions and creatures, item value, engineering, unusual materials, and constructs.
  • Lore: The subject of the Lore skill's subcategory.
  • Medicine: Diseases, poisons, wounds, and forensics.
  • Nature: The environment, flora, geography, weather, creatures of natural origin, and natural planes.
  • Occultism: Ancient mysteries, folk superstition, obscure philosophy, creatures of occult significance, and esoteric planes.
  • Religion: Divine agents, divine planes, theology, obscure myths, and creatures of religious significance.
  • Society: Local history, key personalities, legal institutions, societal structure, and humanoid culture.
Using an applicable Lore to Recall Knowledge about a topic, such as Engineering Lore instead of Crafting to find structural weaknesses in a bridge, typically comes with a lower DC. Your special interests can pay off! In some cases, you can get the GM's permission to use a different but related skill, usually against a higher DC than normal. The GM might allow checks to Recall Knowledge using other skills. For example, you might assess the skill of an acrobat using Acrobatics. If you're using a physical skill (like in this example), the GM will most likely have you use a mental modifier—typically Intelligence—instead of the skill's normal physical attribute modifier.