Lore: Dungeoneering

Lore: Arcana represents your knowledge of aberrations, caverns oozes, and spelunking.

Modifying ability: Intelligence

Classes: Arcane Scholar, Arcane Trickster, Archmage, Assassin, Bard, Cavestalker, Dissonant Chord, Divine Seeker, Dragon Warrior, Frost Mage, Ghost-Faced Killer, Guild Thief, Harper Agent, Invisible Blade, Master of Disguises, Pale Master, Ranger, Red Wizard, Rogue, Shadow Adept, Shadowdancer, Wilderness Stalker, Wizard.

Requires training: No

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).

Use: Usually none. In most cases, making a Knowledge check doesn't take an action. You simply know the answer or your don't.