The Vampire Conflict is one of the core arcs of the Storyline Manga. Introduced during Halloween 2k7, this story arc brought a lot of major changes to the storyline as well as changes to the actual site; including the existence of vampires, the fate of Johnny Gambino's wife and the reveal that Ian is a member of the Von Helson Family.
Issues:
The Vampire Conflict #1:Convergence
The Vampire Conflict #2:Damian