What is the fine-grained topic of the following text: The story of Dark Apostle Marduk continues and his goal of using the ancient Necron technology to essentially propel himself higher up the food chain and bring as much chaos to the Imperium as possible is fought with peril from within and without. Only return the topic.
The continued story of Dark Apostle Marduk's ambition to exploit Necron technology and destabilize the Imperium.