Magical Leylines

The Magical Leylines were at the very center of civilization in the time before the Chaos Wars, many of their secrets were lost in the war. What is known with absolute certainty is that the Arcane Cathedral specifically and explicitly forbids any magical ability that taps into their power, with the only exception made for Sorcerors who are immediately sent to the Guild of Seekers when they come of age in order to remove them from built up areas as often as possible.