| Arcana |
Spells, magic items, eldritch symbols, magical traditions, planes of existence, and certain creatures (Aberrations, Constructs, Elementals, Fey, and Monstrosities) |
| History |
Historic events and people, ancient civilizations, wars, and certain creatures (Giants and Humanoids) |
| Investigation |
Traps, ciphers, riddles, and gadgetry |
| Nature |
Terrain, flora, weather, and certain creatures (Beasts, Dragons, Oozes, and Plants) |
| Religion |
Deities, religious hierarchies and rites, holy symbols, cults, and certain crea tures (Celestials, Fiends, and Undead) |