Knowledge (planes) covers the Inner Planes, the Outer Planes, the Astral Plane, the Ethereal Plane, outsider creatures, and planar magic.
| Knowledge (planes) task | DC | |:---------------------------------------------------------|:-----------------:| | Know the names of the planes | 10 | | Recognize current plane | 15 | | Identify a creature's planar origin | 20 | | Identify an outsider creature's abilities and weaknesses | 10 + monster's CR |