Each Ley line extends around the entire globe, converging only at the Ley Nexus. Ley lines greatly boost the effects of magical spells of their own spell school if cast near its path; any conjuring done near the Conjuration line, which passes across Eastern Hala, Eastern Nea, and the Western coast of Creta, benefits greatly from the energy emenating from it.
In metagame terms, any spell cast near its corresponding Ley line is granted a +1 to its caster level, or +5 if cast directly on the Ley line. This can only affect spell casters aware of its presence and capable of tapping into its power, requiring a DC 20 Knowledge (Arcana) check. Any spell caster, regardless of awareness, attempting a spell directly on its corresponding Ley line must make a DC 35 Will save or be completely disintegrated in the process, leaving behind no remains. Note: Ley Lines do not in any way affect divine spellcasting.