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Qualities of Ley Lines

Source Occult Adventures pg. 232
A ley line carries raw magical energy along with psychic impressions and other ambient energy its absorbs from its surroundings. This causes ley lines to seed magical effects, subconscious thoughts, and other supernatural phenomena along their paths, and sometimes creates unusual supernatural effects.

Psychic impressions carried down ley lines can impact the cultural and psychological growth of peoples living along the path of a ley line. Such alignments can cause two civilizations separated by thousands of miles—or even separated by planar boundaries—to evolve along similar developmental paths. Towns built on opposite ends of a ley line may have identical (or sometimes mirrored) street plans and similar histories. Artists living near a ley line may unconsciously convey their ideas to other artists on other planes, creating instances of parallel design. When a ley line penetrates planes, it can carry influences from one plane into another, making ley lines partially responsible for the appearance of tieflings and aasimars in bloodlines that had no prior history of contact with outsiders. This effect is also responsible for some of the propagation of sorcerous power, psychic powers, and other unusual magical phenomena such as haunts and loci spirits.

Like the arteries of a circulatory system, ley lines come in many different sizes. The larger a ley line, the more capacity it has to carry magical energy. The size of a given ley line can change over time, however, and may vary at different points along its length. The size of a ley line generally impacts the strength and kinds of power that can be drawn from it by spellcasters. Ley lines have an effective caster level ranging from 1 to 20 that represents the overall strength of the ley line and determines the power of effects associated with it.

Archives of Nethys

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Qualities of Ley Lines