The hallmark of The Hell is a very serious approach to development. First and foremost, it is concentrated on getting rid of all the initial bugs of Diablo & Hellfire. It also raises challenge considerably, gives much more variety (monsters, items, spells, boss monsters, unique items, item & environment colors), improves overall difficulty balance of the game, improves monster AI, introduces new character animations, increases replay value and gives full support for Multiplayer experience. It is the HARDEST of Diablo Hellfire mods. Nowadays version is fully functional, has many bugs of original game fixed, is running smooth, and on average is working way better than original game. The amount of changes is tremendous (trust me), part of them are available in Changes Log file inside the game archive.
Diablo and Hellfire allready being good, this mod enchances it to become the greatest diablo experience. Lots of new monsters and weapons, and more. It's really balanced and the monsters kinda adapts to your level and items. Atleast it feels like it. There is really not much to say about this mod, just download it and play. I promise, you won't regret it.