Monster Lore Checks
Characters can use certain knowledge skills to identify monsters and recall details about their special powers or vulnerabilities. In general, the DC of such a check is double the monster's CR. A successful check allows them to remember a little bit of useful information about that monster. GM's should either read, or allow the character to read, the introductory text of the monster's bestiary entry. If a player instead beats a DC of 15 + double the monster's CR, their character knows quite a lot about the monster in question, and GM's should allow that player to look over the monster's bestiary entry in its entirety.
Basic Monster Lore: DC = double the monster's CR Complete Monster Lore: DC = 15 + double the monster's CR
Warfare can also be used to identify information about a monster's CR, in addition to its offensive, defensive and tactics sections.
Reason may be used to determine the 'programming' of a mindless creature.
Knowledge Skill Creature Type Arcana Constructs, dragons, magical beasts Dungeoneering Aberrations, oozes Local Humanoids, proteans Nature Animals, fey, giants, monstrous humanoids, plants, vermin Planes Elementals, Demons, Devils, Outsiders Religion Undead