Hmm, how long had you been playing? That could be an out of memory error - especially since it crashed without logs doing something you had already done. Let me know if it happens again.

Permadeath was removed as it didn't really make sense for Aground, and a lot of people left it on by accident and lost saves. So, I replaced it with 1-hit death - it's not permadeath and you can load and continue, but if you get hit, you die, which makes a lot more sense for a super hard mode in Aground.

4d 21:21:36 is the time on the save. I just opened the game and moved around a bit (since restarting my computer), and it didn't crash again so I think it probably was an out of memory error. It was the first time on that save I had done the Unnature Sanctuary stuff, though.

I understand the change from Permadeath (although I still like the idea, and it was great for deleting old saves!). Didn't you change it so the difficulty would be set for each save? If so, would you consider bringing it back, and possibly a 1-hit permadeath (hardcore and 1HP hardcore)? Thank you.

Well, you can delete saves with the red button next to them on the saves list (the green one exports them), so you don't really need to use permadeath to delete saves. I probably won't bring permadeath back in vanilla (and it didn't even work in multiplayer), but a mod could add it back if it wanted.

Alright, thank you. I know that there is another way to delete saves, but killing myself was more fun!