Start a new game on extreme difficulty. Then, hold L1, R1, circle, X, triangle, and square, now press start while holding them. This will bring up a screen with resume game, level warp, and invulnerability. Select level warp and go to BGATE3. This will have you go to Baldurs Gate after you defeat Mordoc and Randalla is thanking you. When the credits are over you will have Artemis.