The dreadnaught is Auryx's (oryx) worm . After each kill he claims or each hive that tributes to oryx's worm the dreadnaught it increases in size depending on the power of the defeated enemy due to the sword logic that the ship , which also has a planet inside of it, contains like xithuarath and xi ro's throne worlds. The siblings would kill each other to gain power and satisfy their worms need for power. Also , the ship contains his oversoul and is a paradox.