Backlash

Backlash
''The ground glows with a translucent sheen of green light, as you complete the casting of the preserver's scourge. ''

Also known as the preserver's scourge, this spell makes the ground dangerous to defilers. Should a defiler try to tap into land that is protected by a backlash, she automatically takes 1d6+1 points of damage for every two caster levels you have (maximum 5d6+5). The defiler must make a Concentration check (DC 10 + spell level + damage dealt) in order to continue casting her spell. Once it has inflicted damage, the spell is discharged and the ground returns to normal. Only one backlash can be cast on any given plot of ground.