Darksiders 2 doesn't seem to have any in-game info telling me exactly how the game difficulty will increase if I choose Apocalyptic instead of Normal difficulty. I've seen games handle this in a variety of different ways, such as upping monster health/damage, lowering drop rates of things like healing potions, or even sometimes entirely changing what types of enemies you see, like in Ninja Gaiden.
What specific effect does upping the difficulty have in this game?