Enclave

Enclave is an action-adventure game from Starbreeze Studios and Vivendi. The game takes place in a medieval fantasy world, in a region isolated from the rest of the world by a deep chasm on all side, and is protected from the forces of evil that inhibit the surrounding territory. But the earth is beginning to heal, parts of the chasm are becomming crossable, and war is inevitable. For the first half of the game, you play as one of six characters who must defend the enclave from the invading forces, and for the second half, you play as one of six completely different characters who must invade and conquer the enclave.