"Not that I'm aware of, but Mark does have significant organic components that, theoretically, probably could be brought back among the undead, with proper research and technique."  I do a double take.  That... was far more morbid than I wanted to come across.  "Um... all in theory, of course.  But we don't want to find out... how well-contained is this... 'situation?'  If we can create a chokepoint, of sorts, and Saithe authorizes it, I may be able to create a spell to create a consecrated area that will protect us all within from the most dangerous powers of the undead.  However, the magnitude of this effort could well be... impractical for the results."