One of my guildies (thanks Kiry!) sent this my way last night: It’s a mod called Reign of Terror, a Diablo 2: Lord of Destruction module specifically built around the Grim Dawn Forgotten Gods expansion. The player devs say the mod includes the complete set of acts rebuilt, with all maps and mobs and quests, all seven classes, all the original Diablo 2 items, the hireable mercenaries, new and original shrines, the Pandemonium event, the secret cow level, and new secret areas too. It’s even got its own Wiki.
“Multiplayer works but it is not fully supported yet so keep that in mind in case you decide to play MP,” the author says. Of course, you’ll need to make sure you’ve got Grim Dawn, its Forgotten Gods expansion, and the Ashes of Malmouth expansion, which may set you back more than just buying Diablo 2, especially if you don’t wait for a Steam sale. But where’s the fun in that?