Diablo: Hellfire

Synergistic Software

Industry	Video game development
Parent	Sierra On-Line

Hellfire, frequently referred to as Diablo: Hellfire, serves as an expansion pack for the original Diablo title. It was developed in 1997 by Synergistic Software, a division of Sierra, and published under the Sierra On-Line label. Although Blizzard Entertainment expressed opposition to the project, their parent company, Davidson & Associates, granted permission for its release. During the development of Hellfire, Blizzard North—who were concurrently working on Diablo II—imposed several limitations on Synergistic Software’s creative process.

In 1998, Hellfire was reissued alongside the original Diablo in a combined package titled Diablo + Hellfire. More recently, in 2019, Blizzard Entertainment made the expansion available digitally at no cost when purchasing Diablo through GOG.com.

Overview

Hellfire functions primarily as a single-player add-on to Diablo. While certain multiplayer options can be enabled, it lacks compatibility with Blizzard’s online platform Battle.net, and its modifications do not carry over to characters used in online gameplay. Designed as an optional extension, it integrates smoothly without disrupting Battle.net experiences, allowing players to bypass its dungeons entirely if desired.

The narrative centers on a sorcerer who inadvertently unleashes the demon Na-Krul within Tristram but manages to lock the gates before it can escape. To confront Na-Krul's domain, players must speak with Lester the Farmer located north of Tristram; however, Lester grants access only after specific milestones in the main storyline are achieved.

This expansion introduces two fresh dungeon environments—the Nest and the Crypt—alongside new quests and a variety of items such as oils that enhance character attributes. It also incorporates runes functioning as traps, an additional spell page, new affixes for weapons and armor, shrines, mini-boss encounters, and a more formidable version of the Diablo boss. The Monk class represents the sole new playable character approved for inclusion by Synergistic Software; this class emphasizes staff combat, favors lighter armor types, and excels in unarmed fighting techniques, distinguishing it from traditional role-playing game progression systems. Additionally, two secret classes—the Barbarian and Bard—can be unlocked through file modifications but lack official backstory and utilize existing Warrior and Rogue visual assets.

The newly added items—including oils, weapons, rings, armor pieces, runes, spellbooks, and scrolls—are fully integrated into the game's existing loot distribution system. Enemies unique to Hellfire’s dungeons do not appear in the original campaign and present challenges comparable to those found in advanced stages of the base game, necessitating well-developed characters.

Several quality-of-life improvements are featured as well: a "jog" option accelerates movement within towns; spells are available that highlight objects on floors or teleport players to the closest staircase. These enhancements received approval from Blizzard North and later influenced gameplay mechanics introduced in Diablo II.

Creative conflicts among affiliated companies

Although Blizzard, Condor (which later became Blizzard North), and Synergistic Software were all subsidiaries of Comp-U-Card International, their development activities were not synchronized. Blizzard declined to enable Hellfire support on Battle.net, aiming to prevent complications arising from unverified code. Since Condor/Blizzard North was responsible for creating Diablo II, they held authority over content approval and rejected numerous proposed elements—including the Barbarian class—to preserve exclusivity for their forthcoming game. This dynamic led to dissatisfaction at Synergistic and ultimately produced an expansion that fell short of its potential.

Critical response

Hellfire was well-received for its improvements to the solo gameplay experience. It garnered an A− rating from PC Games and a score of 3 out of 5 from Computer Games Strategy Plus. The expansion was nominated as a finalist for the 1998 "Best Add-On" award by Computer Gaming World, although the accolade was ultimately awarded to StarCraft: Brood War.

Reviews

• Backstab issue #8
• Envoyer (German edition) (Issue 16 - February 1998)