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https://www.nexusmods.com/torchlight2/mods/62

You can now craft a respec potion using 2x uniques and 2x socketables.
The respec potion is the one the devs already included in the game, but which is unavailable without mods.
With this mod you can craft that respec potion, as you can on the Nintendo Switch version.
The respec potion resets all your skills and let you choose new skills.