Fire Egg
What a fascinating specimen! This is a tightly nested bundle of cellular membranes. However, most of the content within and surrounding the various layers is neither air nor water... it's void fluid!
The cells within this capsule are dividing at extremely rapidly, countering the void fluids simultaneous dissolving of its container.
Somehow it has managed to reach an equilibrium between creation and destruction, but I suspect is is not a very stable system. Any irregular disturbance would likely cause a cascading effect on either end of this spectrum, the result of which would be sudden and destructive.
While I would like to hold onto this for further research, I don't think it would be advisable to have something so volatile sitting around here. Especially given my chamber's open exposure to the elements.
I would recommend you be very careful handling this, old friend!