An alter to worship the Cavern's First Hierarchy. The wooden cover was added later and was designed to protect the magical old black stone stelae inside. It is said that only the Three High Priests can use its great powers.
I knew it was yours! Ancient alien culture or Ancient earthbound tribal art? That is what first comes to my mind. One wonders if some sick priesthood controls its people by this... almost seems like that wheel will start spinning and that "tothed mouth" will open and growl when a god gets angry! Spooky! :)
The black-on-black detailing framed by the cleverly shaped brown gives this an amazing look, as though carved from wood and stone. Worshipping what, I find myself wondering... the lower part looks worryingly like teeth!
Love the face you've created in the black. The feel is like another cultural pantheon. This god appears to be a god of war with the roof forming a helmet of sorts. Fantastic colors that lend to a sense of rusting metal. Fantastic!