Iron Man Diablo was a variant heavily played by members of Clan UK, the on-line gaming clan.
The idea was to play the game with virgin characters without making use of the shops or NPCs. No in-town healing, selling or buying or repairing items.
It emphasised the teamwork aspect of the game and made better use of each character class. The best games could last for hours - especially if you were lucky with health and mana pools.