The Red Death is a massive dragon with three pairs of eyes. It is much larger than most dragons, and does not hunt for itself. Instead, the Red Death acts of the queen of a larger nest of dragons, and all the smaller dragons bring it food in tribute. It can control other dragons and make them swarm.
Similar to the Bewilderbeasts, Red Deaths are an alpha species and are capable of enforcing smaller dragons to obey, even against their wills.