Blood of the Void, Book 6 of Outworlder’s Blood - WillPowah

After defeating the eldritch nanomachine tide and saving the Seramist Isles, Kay’s worries aren’t over. His triumphant return home to a flourishing kingdom is cut short by the hordes of vampyr swarming into his territory from the ravaged wasteland. Yet the unknown vampyric “Great One” is only part of the danger Kay must face. Something has been lurking in the background, manipulating events from the shadows to its liking.