A ley-line is a powerful flow of magical energy, invisible to everyone except those who have the Mage-Gift. Ley-lines are formed and flow like rivers, and may cross with other ley-lines, resulting in a Node. Ley-lines are natural phenomenon, but can also be artificially created by very powerful mages. It requires a Master rank mage to tap into a ley-line, as any mage below Master rank would simply be overwhelmed by the sheer power contained in a ley-line.