It’s dehydrated. I would give it a drink and then repot in a better mix after a few days of watering. If you add 50% of rinsed strained perlite or pumice to cactus mix it’ll make your Echeveria ‘Black Knight’ much happier:). The mix you have now isn’t the greatest for succulents because it’s peat based. Generally with succulents you want the mix to dry out, but when peat dries out it turns to concrete and doesn’t absorb water. So your plant becomes dehydrated. Also chokes the roots when it becomes rock hard. On the other side when peat is watered regularly it retains water and is a soggy mess.

Your pot should have a drainage hole if it doesn’t, and when repotting get as much of the old mix off the roots as you can, and wait a week to water after you put your plant in the new mix. Goodluck;).