I didn't know you had to save at the med bay... though it was the bed now 2h of progress+ that annoying tree boss got lost
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I did the same thing lol, %LOCALAPPDATA%\Endeavore_Dawn_Seeker is where your data is saved, make a new save and modify it in a text file editor of your choice. I recommend just taking the player stats file and giving yourself back the skill points and level you had (or more lol) and grinding the bosses, I broke my file by doing more than that.