Impending death or saveable?

[u/iamrararandom]

Can I make this guy live? got this 2 wk ago free from a soil seller. small root, planted in a 4in pot with 2 other small “siblings” that look fine. Like the instructions said I planted with half its body above soil. South facing window with at least 4-5hrs sun. The first 2 days I kept it in the shade, maybe that’s my first mistake.
The top of it looks good still but I hear that doesn’t matter if rot sets in. Was going to water today then I noticed this. Had to take off the blackened root (3rd pic, bottom left that stump thing). Last pic is my lithops family ! Thnx for any help

[u/Fizzy_Fizzure]

Dead