Its presence is still felt in the castle. The Lord wishes to use its power, no matter how much it corrupts him in the process. His personal servants bleed the same ooze that seems to be its blood, and have been corrupted by it. The castle itself seems to bleed the same ooze.

[Healing abilities, and taking the form of those it had consumed...they had been very lucky indeed. It had been trying to get Luke...the Vernacht doesn't need the power of hyperresonance at its command]

For now though, it's sealed within the maze in the garden. The seal is maintained by seven bloodlines; so long as they exist, the seal should be able to be renewed.