Successfully complete the game under the extreme difficulty setting.

Alternately, choose to play The Gauntlet. You will start as Drizzt. Enable the "Invincibility" cheat and complete The Gauntlet within 15 minutes. .At the end where you face the Onyx Golem, use the "Level warp" cheat to go to the Tavern. You can now play the game as Drizzt. Note: You cannot equip any other sword than the ones he has during The Gauntlet. Import a new character into the game and give him the Onyx Sword, since Drizzt cannot use it.

If you have not completed the game yet, enable the "Cheat mode" code, then level warp to the to the bottom (Tower). Defeat Eldrith, go to the Gauntlet level, then level warp anywhere desired.