Uhh.....no. The Dark Arisen content isn't DLC or a simple add-on, it is a complete expansion on the original game. Dark Arisen comes on its own Disc (or 2 Discs in the case of the 360) or is a single large download on Xbox Marketplace and PS Store. Dark Arisen contains the original game with a lot of tweaks and adds the entirely new area of Bitterblack Isle along with it's own Cursed Items, which can be purified to give multiple new weapons, armors and jewelry. 100s of pieces of equipment all completely new and mostly untradeable even between two people owning the same version. Hope it helps, I know it seems confusing at first but with a little more research you'll understand better.
To further add, purchasing Dark Arisen also gives you access to almost all the DLC originally released for the original game (Dragon's Dogma).
So Dark Arisen gives you:
- The original Dragon's Dogma game
- Some Dragon's Dogma DLC
- The Dragon's Dogma: Dark Arisen expansion