This is "The Bone Collector". I made it to contribute to a charity project a while back. A load of painters and builders contributed to an unorthodox, community Armies on Parade board. It even featured in the 2020 Warhammer community roundup of the armies on parade winners!
The board concepts was a gladiatorial pit on some sort of fringe world. I'm really pleased with the mini contributed, I enjoyed the build and it was interesting to paint.
-Adam
There's more about the build here...