Magic on the Planes (PWH)

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Whether a body's traveling along the Great Road, hiding from the Hardheads in Sigil, or swimming through the plane of Water, magic makes the job easier. It's vitally important, and it's everywhere. Practically every planar creature—fiend, celestial, or otherwise—has some magical power or innate ability.
On some prime worlds, magic is rare and therefore thought wondrous and mysterious. Now, away from the Prime Material, magic is still a wondrous thing, but what berk has time to ponder it all? Planars see the bigger picture, in which magic is only a component. Spells allow folks to reach beyond their mortal limits, but wizards on the planes ain't the lords of unknowable secrets that they are on the Prime.
Priests serve as agents of the powers themselves, but that doesn't make their magic invulnerable. Fact is, their spells work in relation to their deity's proximity. When a body's traveling the planes, distances of separation can stretch pretty far.
That said, every planewalker—spellcaster or not—should know a little about how the planes affect magic. If a berk thinks that magic works the same everywhere, she's in a Jot of trouble, and has a good bit of catching up to do. Try to keep up.