Knowledge (the planes)

Knowledge (the planes) covers all the planes besides the Prime – Inner, Outer, Elemental, Astral and Ethereal, their denizens, and planar magic. It is, perhaps, one of the broadest knowledge categories besides Knowledge (arcana); due to the sheer wealth of knowledge to be had here, there are many who specialize in subskills.

A PC can specialize in a given set of planes – Inner, Outer, Elemental, or Astral and Ethereal – or in a group of creatures that come from those planes – fiends, elementals, angels, etc.

Planar Denizens

The PC is especially knowledgeable in a specific group of planar beings. Generally speaking, he can choose one alignment axis (good, evil, lawful, chaotic), elementals, or denizens of the Astral and Ethereal planes as a focus of study.

On a DC 10 check, the PC can identify a common creature of that type (anything that the DM deems common) on sight. This DC increases relative to the creature's uniqueness – less common outsiders are DC 15, and very rare or unique ones are DC 20+. On a check of DC 10 + ECL, he can recall some useful bit of information about the creature – intelligence, diet, abilities, etc.; for every 5 points over the DC, he can recall another piece of useful information.

Planes

The PC is especially familiar with a given subset of the planes.

On a DC 10 check, the PC knows one useful bit of information about a given plane – planar traits, rough geography (terrain and weather, if any), and what kind of creatures can be found there, including demon lords and divine beings. For every 5 points over the DC, he can recall another piece of useful information.

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