A ley line are natural streams of magic running all over the world, often connecting places with outstanding magic and supernatural energies.
Ley lines are made up of various kinds of energy; whatever kinds are more prominent in the line affects its properties. There are, for example, ley lines with defensive, disruptive, or restorative energy
They can be tapped into by magic users to draw power from them. Using a ley line is the most powerful means of employing magic known to mortal wizards
Some might be more stable which means that it is better to use when a stable flow of energy is needed. Others might have destructive energies, which means it is better to use in battle. The island Demonreach has a ley line that has certain malevolent properties. This makes people who go near the island unconsioulsy vear away.