I have just finished writing the history behind where my Necron Dynasty comes from.
They are called the 'Anapnut Dynasty' and are a fleet based Necron force.
"The Anapnut dynasty is a rare thing amongst the many dynasties
of the Necrons. They are an almost entirely ship based dynasty, the nobles
choosing to rule from massive world engines more akin to metal moons than
spaceships. Each of these ships houses
hundreds of thousands of Necrons and is commanded by an Overlord. Each world engine is supported by a seemingly
countless fleet of smaller craft ranging from smaller Dirge escorts to huge
Tombships. All of the Overlords answer
to the Anapnut Phaeron Keksuhad Sekhrey. Keksuhad leads his forces from his
supreme world engine known as Sekhmit.
The Anapnut dynasty has been a heavily shipped base society
well before the biotransference that saw them transformed into the soulless
metal beings they are today.