Here are the best places to find reliable Grim Soul save files and mods:
Look for the toggle under the account section. grim soul save data high quality top
If you play on two devices, always "Hard Save" (exit to main menu) before switching devices. Playing the same save on two devices simultaneously causes a "Conflict" error where you lose the last 10 minutes of progress. Here are the best places to find reliable
This method works for both unmodified and modified game versions: grim soul save data high quality top