Try the Houseplant forum. Certainly nothing whatsoever to do with landscaping.

A link would have really helped, as I obviously could not find a houseplant forum.

Looks like root rot. Probably overwatered.

Hi Ricky, I thought root rot too but was really confused when the plant fell apart from the top down. It started melting from the offshoot down, but then the base of the plant and its roots felt firm and healthy for the most part. Have you seen that before from root rot?

Here is after I rinsed the roots off a little bit.

there are enough white roots to attemp recovery.

but, there are dark-brown roots here an'there - that's the rotten roots.. they are very soft and you can just remove them with your fingers, they'll fall off. you can try then fine cutting with small scissors to remove all brown looking roots. and you need to soak the root ball in some disinfecting solution with alcohol (like 9:1 water with rubbing alcohol) or 3%peroxide with water solution (1tb per 1qt) for 5-10 min or so.

after that i would plant in 100% sterile perlite for rerooting/recovery. no soil-mix until it starts growing (IF it doesn't rot more), then you can repot.

make sure the top cut is clean - no dark spots. you already cut it, but generally i'd cut an inch below any rotting signs in the cross-section.

Thank you, Petrushka! I tried pulling off those roots because I thought they were rotten too and they didn't budge. I would have had to cut them. Just bought some more perlite because I have a prayer plant that may need this treatment, too. Such a strange and abnormal case of root rot! Thank you for all your help. :)

i've never seen that type of peperomia before - it's very unusual. it's really cute!

so i googled and they say though it's a succulent, it's also epiphytic. so it requires perfect drainage.

but it's from rainforest of central america - so..it should be able to handle frequent watering IF it's in super free draining medium. my guess would be it rooted from the top 'cause water got into the crown - perhaps it's best not to allow water to get into the leaves.

so putting it into a soil mix with bark/perlite/scoria mostly should be best.

I agree, I think that is what happened. I just found out that my coworkers watered my plants while I was away as a favor to me, but they do not know plants and I think that is why this happened while I was gone. So frustrating because I lost it! :(