Shadow of the Dark Fortress (Part 2)

Voldemort builds a terrible fortress christened the "Xanthius" to project more terror to the Wizard World. ACT 2: "The Xanthius" -Lucius hatches a plan to retake Harry back to Xanthius for Voldemort using an mysterious asset at Hogwarts. Who or what could it be? Adding to Harry's worries is helping Hermione with her different troubles while dealing with the invasion of wizards in Hogwarts suspected to be Death Eaters and part of the plot to capture him again for Voldemort.