Graphics and sound rips.
Diablo is basically Blizzard's second most famous action role-playing series, next to Warcraft, where instead of fighting orcs, you're essentially on a mythical quest to murder everyone's friendly neighborhood dark-lord.
Originally, the town of Tristram was going to feature a priest, Tremain, who would've guided you in the last few missions, only to have been killed by a cursed sword. It's unknown why he didn't appear in the game, but both graphics and sounds exist for this character.
In the Hellfire expansion, a Wandering Merchant was to appear and give a quest. Although no graphics for this character appeared in the retail version of the game, an animation of the character was given later by the developer of the expansion.
One of the videos accidentally vanished. Find it.
In the game files, there exists references to a quest titled The Map of the Stars. If the player did not find the map in time, a video would be shown and Diablo would become more powerful because "the stars would align" (or something). Graphics and dialogue from the various townsfolk have been found. There are two unused cinematics in the game files related to this quest. One is shown upon using the map, and one is shown when the map hasn't been found in time.  According to David Brevik, this quest was removed from the game because it added an undue sense of urgency.
Installer Hidden Developer Messages
Hidden between the horns of the Diablo graphic, found in the setup and boot executables for the first Windows release, are two hidden developer messages.
The text on the left reads "BUY WAR II" while the other reads "NATALIE PORTMAN ROCKS." While the one on the right is rather self explanatory, the left text "BUY WAR II" is speculated to refer to Blizzard's Warcraft II games, which saw their release in '95 and '96, around the same time as Diablo's release.
|The Diablo series|
|Windows||Diablo • Diablo II • Diablo III|
|Mac OS||Diablo II|