interesting challenge
well, here’s my contribution

since every solid chamber has pylons ,I started with one ,modified letter A for base ,since I pictured it as radial chamber took a spline to align pylon,and arrayed them,
made sphere cover,something like a gallery around it,and chose camera to view the chamber entry position.

Also added a sphere chamber , to be seen from the entrance,
A place where some big bad boss should take place,
Made a bridge at the entrance so that player entering the room should
Have a better view, and of course more choice with entering the chamber.
For the lighting I chose to have something like a lantern at the top of a chamber dome
That should give an lighting accent at the middle, and spread light around the chamber

Then , I made radiosity calculation to see lighting effect

[color=white]So far didnt care for poly count and whether geometry is ok cause this is concept phase.
theres a lot of work ahaed, finishing the concept, defining details etc.
thought about making sphere inner chamber hollow or transparent for the player to se some depth , with strange sparkiling lights,…
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