Fantasy magic using lay lines
I was wondering if anyone had created a magic system that used lay lines to control the amount of magic a person could cast at any one time. For those of you not familiar with lay lines, they are lines of magical force that magic users draw on to power their magical spells. The basic idea is that if the lay lines are strong and close a mage can cast more powerful spells than normal. If the lines are weak or far away the mage can only cast weaker spells.
The best thought I've come up with is require magical users to take all spells in a multi-power pool and power the spells from an END Reserve. Both the multi-power pool and the END Reserve must have a +0 power advantage "Active cost affected by lay lines." This would allow me to tell players at any given time whether their spells would be normal, extra strong or weaker than normal.
As a side effect, Magic users would get an extra sense similar to Mental Awareness that would allow them to sense Lay Lines and other mage's spells. e.g. spells with invisible power effects, etc. Mostly a role-playing aide.
Anyway, I was wondering if anyone else had tried a similar system and how they managed the cost accounting of it.
Thanks
