DMC1 is an abandoned island. DMC3 is an ancient demon tower. But DMC4 Is just a city, where people are supposed to live. So how is ANY of this explained(primarily the hallway of never ending fireballs that's there for no apparent reason) I would think the castle is abandoned but there's a RECENT portrait of sanctus in the main hall so it clearly can't be THAT abandoned because someone had to put that there