Icewind Dale: Heart of Winter is an official expansion pack to the computer role-playing game Icewind Dale developed by Black Isle Studios. It introduced many changes and additions to the original game, and included an all-new campaign.The game is still based on the Advanced Dungeons & Dragons 2nd edition ruleset, but like Baldur's Gate II: Shadows of Amn, it included several changes (such as new spell progression tables) from the 3rd edition ruleset.