Ley lines

Ley lines are the veins of arcane energy crawling across the surface of a planet. Most ley lines cannot be seen with the naked eye. Most arcane users can feel the ley lines, where they go, how strong they are, and the most powerful of them can directly manipulate them. Some arcane users redirect ley lines, pointing them to their sanctums. Others still, can "raise" the ley lines from the planet's core, and bring it to the surface. Ley lines that have been exposed to the surface ooze liquid mana, which coagulates into crystalline formations.