Can I restart the difficulity?

[SudianX-1494]

In single player there is a way to turn on infinite respecs. Here is a description I found in another thread:

@Indian-2161

You need to add a command Line in the launches advanced settings.
You write -enablerespec then launch the game. Open your character window, you’ll se the + at every attribute is red, you must not have any leftover points. Then alt+klick any + sign and, BAMM you can respec all your attribute and skill points.

By the way: Thorns was one of my more enjoyable playthroughs for normal and nightmare difficulties back in the LoD days (before a D2R patch nerfed thorns in some weird way). I was very sad when in stopped working so well in late Nightmare