It looks like it's giving up on the main trunk. I'd dig it out and replace with fresh succulent soil.
Also that skull, is it a pot with drainage holes or is it a bucket with water sitting in the bottom to rot the roots?
I think you're going to wind up losing the trunk and having a medusa head of it's replanted children.
If you're South-East, I've got bag of succulent mix in Springvale and can help drill some drainage holes.