Actually seeing as how Naggaroth is Warhammer Fantasy Canada, The Druchii probably take pride in being the only ones able to create large batches of Icewine, which requires a sweetspot of cold temps to grow grapes and freeze them in the particular way Icewine requires to concentrate sugar. Normal wine would be considered 'sweet' at around 35 grams of sugar per liter, and Icewine has a sugar content of around 160 grams per liter. For reference, Coca-Cola has a sugar content at around 100 grams per liter I think.
Canada is the world leader in Icewine production, and makes more than the next five countries combined or something like that.
Just one of those things I remember from selling booze in a liquor store. Icewine starts with pretty expensive prices.