Risen 2: Dark Waters is a direct continuation to Risen, featuring the same nameless hero and some of his old companions, Patty and Steelbeard, but set in an entirely new ambientation. Risen 2 parts from the sword and shield medieval fighting world of Faranga to a musket, pistol, cannon and sabers fighting modern age.
Risen 2 is set in the age of the conquistadors, where a kind of sabre-fighting and musket-shooting Spanish fleet is invading new lands inhabited by spear-throwing and voodoo-casters natives. You, a "good pirate", must fight the "bad pirates" for relics to fight the water titan lord, Mara, and for that, you need to choose to side with the inquisition, which will give you muskets, or the Natives, which will give you voodoo spells.
It is a story about the romantic and cliche view of pirates, With a lot of rum, eye patches, parrots, typical clothing and speaking, etc. Despite being a mediocre RPG, the story is captivating. If you see it on a sale, it is worth buying and giving a chance.
If you have played Risen before, you'll find better and worse aspects in comparison:
First, the battle system was crippled. It's a shame, since Risen battle system was very good. Even without training, one could battle stronger enemies given enough skill. Now, without training, you can't do anything but swing your sword around. You can't dodge anymore, the dodge was changed to a kind of roll, which is not only unrealistic (because you roll too far away) but serves only to flee, since you don't end up in a good position to counter attack.
Second, magic was removed from the game. It just didn't fit in the modern feel the developers wanted for the game. Instead, it was changed for voodoo, a kind of cursing spells used by the natives, that is almost useless for combat but adds interesting events in the game.
And third, for the good news, quests are less linear and more interesting.