Thraben is the largest walled city in Innistrad, although parts of Nephalia’s seaports are more densely populated. It’s the seat of the Avacynian Church, built as a city of walls and various bulwarks designed to keep supernatural threats at bay. While smaller settlements are constantly under siege by monsters, the inner parts of Thraben and the Cathedral are the safest areas in Innistrad, which sometimes gives the bishops of the church a skewed perspective on how dangerous the world outside really is.