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"Reign of Terror is a full remake (not a 1:1 copy) of the classic ARPG Diablo II, and includes all content and classes present in the original Diablo II, including its expansion, Lord of Destruction. It uses all the original sounds and music, and even all the cut scenes available in-game. In addition to this, as this is a Grim Dawn mod, it also features all Grim Dawn Classes and items, and all of the core mechanics of Grim Dawn.
Since the core mechanics cannot be changed, a perfect Diablo II replica is not possible. This is as close as it can be however."
https://www.reignofterrorgd.com/startingguide