It seems to me dark miracles are kind of funky. Come to think of it, dark sorceries are a bit funky too. The devs probably should've just grouped them together into a hex class of some sort with its own type of catalyst. I understand that dark, by its very nature is not intended to work efficiently, but stacking faith only for Dark Blade and having to stack intellect as well for dark infused weapons and other spells feels like a waste of stat investments. As much as DS2 kinda bugged me, they got hexes pretty much right on the money.