Knowledge (Planes)

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Knowledge (Planes) (Int; Trained Only)

You are educated in the infinite planes of existence, which allows you to answer both simple and complex questions on that topic. Specifically, Knowledge (Planes) allows you to make checks to reveal information on the Inner Planes, the Outer Planes, the Astral Plane, the Ethereal Plane, the Deep Dark, outsiders and planar magic.

Check

Answering a question on the topic of dimensional planes has a DC of 10 (for really easy questions), 15 (for basic questions), or 20 to 30 (for really tough questions).

You can use this skill to identify elementals, demons, devils and outsiders and their special powers or vulnerabilities. In general, the DC of such a check equals 10 + the monster's CR. For common monsters, such as goblins, the DC of this check equals 5 + the monster's CR. For particularly rare monsters, such as the tarrasque, the DC of this check equals 15 + the monster's CR, or more. 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.

Task	Skill DC
Know the names of the planes	10
Recognize current plane	15
Identify a creature's planar origin	20

Action

Usually none. In most cases, a Knowledge check doesn't take an action (but see “Untrained,” below).

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.

Special

You cannot make an untrained Knowledge check with a DC higher than 10. If you have access to an extensive library that covers a specific skill, this limit is removed. The time to make checks using a library, however, increases to 1d4 hours. Particularly complete libraries might even grant a bonus on Knowledge checks in the fields that they cover.