Dreadnaughts are the replicators' seeding vessels. They are comprised of 3 billion monads working together, compacted into the shape of an enormous airborne ship. Dreadnaughts are almost 200 feet long. They weigh approximately 55,000 tons (or about half that much when the base material is mithral). Dreadnaughts are both heavy artillery and seeding ships to help the replicators migrate.