From the sounds of it, magic and miracles have been toned down a bit in Dark. You can no longer farm spices to boost your MP when it runs out so you can cast more spells - I think you can only cast spells a limited amount of times between bonfires. In Demon's, playing as an all-out mage made quite a bit of the game a lot easier, and you missed out on the melee combat which it one of the best things about the game.
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