School Doodles- Decainis Center

Concept of what the center of the Decainis volcano looks like, it's kind of like a throne or the house for the council members.  
It's suppose to be a giant Quartz crystal with what's called a Phantom inside of it. I'm definitely going to draw a more detailed version because I know imagine it surrounded by a mound of stalagmites with all sorts of tunnels.