'The Dark Parish' happens to be L4D2 campaign 'The Parish' except you guessed it, it is dark now. It makes sense now, but when I was having a mass download of all these maps, I kind of just went for a load rated 70 or higher, never really looking at descriptions of well many of them. This one included I should of put two and two together really due to the name, but it never clicked until I loaded in game.
As most people all ready know 'The Parish' map as it is one of the official l4d2 campaigns I will not bother going in to full blown detail about it as 'The Dark Parish' is pretty much the same as it's day time counter part. There are a few differences though, there seems to be more zombie spawn areas and less supplies lying about. Anyway here is a video of my attempt at this campaign, be warned it isn't the greatest footage in the world.
Next campaign on the list is 'Left Behind'