When a druid turns away from the land, the land turns away from her. Some ex-druids make peace with this change; others seek to restore the bond. A few, however, actually embrace their disconnection from nature and become forces of destruction. These few, called blighters, leave their mark wherever they tread.
A blighter gains her spellcasting ability by stripping the earth of life. A swath of deforested land always marks her path through the wilderness.
The vast majority of blighters are nomadic loners constantly in search of green lands to destroy. Some are grim; others laugh at the destruction they wreak. Almost all, however, are friendless and mad. What puts them over the edge is the knowledge that nature gets the last laugh: To gain their spells, they must seek out the richest forests of the land, even if it's only to destroy them. Thus, even though they've turned away from nature, they must constantly return to it.
Only human ex-druids seem attracted in any number to the blighter's path. Legends say that a few elven druids have also turned to destruction over the millennia - a terrifying prospect given how much land they could destroy in their long lifetimes.