What is the Patient Zero Requiem Pack and is it included in the deluxe edition of World of Assassination?

I just bought the World of Assassination deluxe edition but feeling very confused about the dlc. I see they list the Patient Zero campaign as being part of the edition but there is a seperate dlc called Patient Zero Requiem Pack? Is this the same thing or something I different I need to purchase that doesn't come with the deluxe edition?