Here are some detail concepts of the bansula egg and crytrog door.

The door is ceremonial in presentation, and runs off a plasmid life-force that is held in stasis by the sacred yaggridisl stems. They power the door and allow them to be used as conventional entrances between rooms and gateways to other rooms in parallel harmonic dimensions. The closeup of the egg reveals its technology and a juvenile bansula who is emerging into the new world from embryonic form. Hooray for junior.

To see a higher res version of this image click here.