Adds a Dark Brotherhood calling card that can be made with the tanning rack, also allows paper rolls to be made using firewood just to allow easier access to paper rolls to make the calling cards.
They can be made after you do Nazir's first assination missions. (the charcoal version allows charcoal to be made at the smelter, from firewood again.)

There are two versions, one requiring charcoal and one that doesn't while they shouldn't conflict ( I haven't actually checked) there is only meant to be one in use at a time.