: So far as we know, the Leveller always dies (at least
: before the next war), whether his side wins or loses.
: When the Hero loses, he dies; when he wins, he lives
: for a few hundred years max before becoming a
: Leveller himself.
So far as we know, meaning it happened in the only dark age we know about. It think it's possible that if a Fallen Lords seeks to be a ruler, and not a destroyer, they could survive the whole era. Obviously, a destroyer couldn't last a thousand years without likely wiping out the light.