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Originally developed by Synergistic Software and released in 1997, Hellfire is not an official Blizzard product and did not carry the Blizzard endorsement or label. Despite that, in response to Diablo players expressing a desire to experience the content, Blizzard gave the go-ahead for it to be included as a free add-on with Diablo purchases on GOG.COM. Hellfire features a non-canon single-player story in which players must defeat a powerful demon named Na-Krul who threatens Tristram. The expansion also adds a Monk class, new weapons and items, new quests, locations, dungeons, and enemies. Hellfire will be available at the launch of the original Diablo.