That looks like rotted plant (most likely beyond help) - from way too much water.
Did you buy it in that glass container? While it may look nice, glass is usually not suitable, again unless you are experienced grower. Many stores sell succulent/cacti in a terrarium and it looks good in the store, but these should really be considered a short-term plantings. You mentioned that you never watered them - but they could have been very wet from the store to begin with.
Heavy soil and no drainage are usually a "death sentence" - unless one is very experienced with plants...
There seem to be another glass container next to it and that one has even smaller top opening. Are there succulents in it? It would be even worst since there may be too much humidity for the succulents.
Should you get a new succulent, it would be recommended to re-pot into very well draining soil (without peat and sand), into a container with drainage holes. Most succulents need lot of light.
Rina

Hi All

Thanks for your responses and i am sorry for the delayed reply. Work has been crazy.
Rina, I bought it in that glass container from a botonist who has been working with cactii and succulents for decades. I am astounded that she did not warn me about drainage, or why she even offers them as products like that. I had never watered it so unfortunately my first reaction was the wrong one. The spheres next to that one have large openings on the sides ( almost one whole side, if it were a square) and they seem to do alright and i have fed them a fair amount of water ofver the years. This one however, only lasted a few months. Pity :(

Chris, thanks for your advice i will definitely do that in future!

Cheers,

These types of arrangements are becoming more and more popular. It's a shame that the vendors will not be honest and tell the buyers that these are temporary arrangements: no succulent can thrive (and will most likely die off within a month or so) in a non-draining container like that. Of course, if the vendors were honest, no one would buy them.

I agree with the other commenters about rot and suitable environments. If there are any non-rotted leaves, you could try to propagate it? I can't see all of the leaves from this photo, but try and check them all if you want to regrow this species.

Yes, it's a shame there isn't at least a note on the label for them to be eventually re-potted.
(Especially from someone who claims to be working with these plants for decades. I think I would take time to pay a visit & nicely ask - WHY?...)

Arrangements in glass containers look nice when 'fresh' and that's how are ppl taken advantage off.
I would recommend to you to re-pot any plants in glass container into a plastic or clay/terracotta pot. You can always get a nice cache pot if you want 'nice' display. This would be without drains, you just have to take plastic pot out after watering and make sure you empty cache pot of any accumulated water.
Rina