Threadfighters in "Dragonriders of Pern" series

In Anne McCaffrey's "Dragonriders of Pern" series, "Threadfighters" are brave and skilled individuals who ride dragons to combat the deadly threat known as Thread. Thread is a destructive organism that falls from the sky, devouring all organic matter it touches. Threadfighters form a symbiotic relationship with their dragons that allows them to fly and use their dragons' fiery breath to burn Thread before it reaches the ground.

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