Envolvium Nothingium+

Envolvium Nothingium+ is a hypothetical element with atomic number 2184. If any Envolvium+ Form's Energy gets used up, it will become an Envolvium Nothingium+. It is like obsidian but harder and darker. After any Envolvium+ Form has been transferred into Envolvium Nothingium+, It can't transfer to any Envolvium+ Form again.