Initially, we would have to concede that the Blade of Woe is pretty useless. It's no better than a basic iron dagger, and worst of all, it takes up a permanent spot in your inventory as it is considered a quest item. However, holding onto this weapon and completing the Dark Brotherhood questline can be a very worthwhile thing, as the Night Mother will enchant this item and scale its power to your current level, which can make this a very powerful asset indeed.