: Always manually back up your save files before using an editor. On PC, save data is typically located in your local AppData or Documents folders.
: Correcting "soft-locks" or experimental builds that didn't work out as intended. Single-Player vs. Multi-Player Ethics Torchlight 3 Save Editor
Because the game is no longer receiving major updates, the modding scene is stable. Here is the step-by-step process. Torchlight 3 Save Editor Backups : Always manually
After making your changes, save the file. You'll then need to import the modified save back into your game. Torchlight 3 Save Editor
If you share these details, I can find the exact steps or download links for you.