All Referances to Rifts (tm) and GURPS (tm) are without permission and are used only in a written-by-fan-for-fans document from which nobody will see any money.
Ley Lines
Ley Lines (Close Proximity): High Mana [1/2 cost/x2 Range/+4 Skill]
Ley Line Nexus: Very High Mana [no cost/x4 Range/+6 Skill]