Not sure where the 3-D printed part is from (the rock with the skull on it) but the rest is scratch-built. The shield is from an Age of Sigmar Stormcast Eternals miniature.

This small piece of terrain inspired by the section on monoliths in the book ‘Realm of Chaos: The Lost and the Damned.’ It’s a monolith erected to mark the pit of a former Champion of Chaos, now reduced to a gibbering Chaos Spawn and jailed within by a rusting iron grate.

Followers of Chaos will sometimes bring offerings to this once renowned warrior. And look at that…! It seems as though a couple of deranged cultists are attempting to get its attention right this second…!