For generations, the dragonriders had dedicated their lives to fighting
Thread, the dreaded spores that periodically rained from the sky to
ravage the land. On the backs of their magnificent telepathic dragons
they flew to flame the deadly stuff out of the air before it could reach
the planet's surface. But the greatest dream of the dragonriders was to
find a way to eradicate Thread completely, so that never again would
their beloved Pern be threatened with destruction.