[top]Knowledge (Int; Trained Only)

Like the Craft and Profession skills, Knowledge actually encompasses a number of unrelated skills. Knowledge represents a study of some body of lore, possibly an academic or even scientific discipline.
Below are listed typical fields of study.
  • Arcana (ancient mysteries, magic traditions, arcane symbols, cryptic phrases, constructs, dragons, magical beasts)
  • Architecture and engineering (buildings, aqueducts, bridges, fortifications)
  • Dungeoneering (aberrations, caverns, oozes, spelunking)
  • Geography (lands, terrain, climate, people)
  • History (royalty, wars, colonies, migrations, founding of cities)
  • Local (legends, personalities, inhabitants, laws, customs, traditions, humanoids)
  • Nature (animals, fey, giants, monstrous humanoids, plants, seasons and cycles, weather, vermin)
  • Nobility and royalty (lineages, heraldry, family trees, mottoes, personalities)
  • Psionics (ancient mysteries, psionic traditions, psychic symbols, cryptic phrases, astral constructs, psionic races, and psionic monsters)
  • Religion (gods and goddesses, mythic history, ecclesiastic tradition, holy symbols, undead)
  • The planes (the Inner Planes, the Outer Planes, the Astral Plane, the Ethereal Plane, outsiders, elementals, magic related to the planes)
[top]Check
Answering a question within your field of study has a DC of 10 (for really easy questions), 15 (for basic questions), or 20 to 30 (for really tough questions).
In many cases, you can use this skill to identify monsters and their special powers or vulnerabilities. In general, the DC of such a check equals 10 + the monster?s HD. A successful check allows you to remember a bit of useful information about that monster.
For every 5 points by which your check result exceeds the DC, you recall another piece of useful information.
[top]Action
Usually none. In most cases, making a Knowledge check doesn?t take an action?you simply know the answer or you don?t.
[top]Try Again
No. The check represents what you know, and thinking about a topic a second time doesn?t let you know something that you never learned in the first place.
[top]Synergy
If you have 5 or more ranks in Knowledge (arcana), you get a +2 bonus on Spellcraft checks.
If you have 5 or more ranks in Knowledge (architecture and engineering), you get a +2 bonus on Search checks made to find secret doors or hidden compartments.
If you have 5 or more ranks in Knowledge (geography), you get a +2 bonus on Survival checks made to keep from getting lost or to avoid natural hazards.
If you have 5 or more ranks in Knowledge (history), you get a +2 bonus on bardic knowledge checks.
If you have 5 or more ranks in Knowledge (local), you get a +2 bonus on Gather Information checks.
If you have 5 or more ranks in Knowledge (nature), you get a +2 bonus on Survival checks made in aboveground natural environments (aquatic, desert, forest, hill, marsh, mountains, or plains).
If you have 5 or more ranks in Knowledge (nobility and royalty), you get a +2 bonus on Diplomacy checks.
If you have 5 or more ranks in Knowledge (psionics), you get a +2 bonus on Psicraft checks.
If you have 5 or more ranks in Knowledge (religion), you get a +2 bonus on turning checks against undead.
If you have 5 or more ranks in Knowledge (the planes), you get a +2 bonus on Survival checks made while on other planes.
If you have 5 or more ranks in Knowledge (dungeoneering), you get a +2 bonus on Survival checks made while underground.
If you have 5 or more ranks in Autohypnosis, you get a +2 bonus on Knowledge (psionics) checks.
If you have 5 or more ranks in Survival, you get a +2 bonus on Knowledge (nature) checks.
[top]Untrained
An untrained Knowledge check is simply an Intelligence check. Without actual training, you know only common knowledge (DC 10 or lower).

System Reference Document -> Skill Descriptions
 
This article is a D20 reference page
The System Reference Document is a comprehensive toolbox consisting of rules, races, classes, feats, skills, various systems, spells, magic items, and monsters compatible with the d20 System version of Dungeons & Dragons and various other roleplaying games from Wizards of the Coast.
 

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