New skill trees with 210 new skills, new base items, gems, runes, uniques, runewords, sets, crafting improved monster AI and new monster types, elite and heroic monsters, 28 uberquests for advanced characters, 5 challenges. Compatible with Diablo II Lord of Destruction 1.10/1.11/1.12/1.13 (PC/Mac).
From my experience of playing Diablo II on and off over the course of the past 8 years (I think), this mod brings back the whole Diablo experience on whole other level.
With all new runewords, gemwords, item stats, character builds, this mod is extremely fun, challenging, and just all around awesome.
The only other time I had this much fun playing Diablo II, was when I first bought the game those many years ago.
Remember that brick wall you hit when you beat Baal on hell difficulty? This is were this mod is just getting started. There are many uberquests (all based on actual Diablo lore) to keep you going, ranging from moderately challenging to painfully difficult (but doable). And they give nice rewards for beating them in the form of unique charms. And if you like the early game, there are challenges and minigames for that too.
Also, remember finding that unique Shako or that good rune? Me neither. This mod has some hard to find items, too, but at least there is a chance you will find them in this lifetime.
These are just two changes among many that greatly improve the original game for me. The amount of work put into this mod is just unbelievable. It's not retardedly difficult or complicated, like many of the other mods for this game. And if there is anything you need help with, you can go to the website. It has documentation on the mod, like the Arreat Summit's website for the original, and there is an active forum with more in depth information and the ability to ask questions.
Which brings me to the reason why this got a 9 instead of a 10: the community. Apart from a few nice and helpfull individuals it's filled with trolls, whiners and other insecure nerds. Which would be nothing new for a gaming community on the internet, if it weren't for the fact that the modmaker and admins are no exception. Bring your flameshield if you ever think of actively participating on the forums, you will need it.
But all in all, this mod has me hooked for more than a year now, which is something not many company-made games have achieved, so kudos to Laz for that.