This art from 2016 depicts an early concept for what would eventually become Umarak the Destroyer. It was first seen at the end of the reboot in the art book The Art of LEGO BIONICLE, alongside many other notable pieces of concept art.

While I have a soft spot for the final design of Umarak the Destroyer, the early Cthulu-like design has its good points. The mask is a far cry from the Mask of Control it would have presumably mutated from, but still close enough for me to make the connection in the first place. More to the point, Cthulumarak’s rocky body makes him look more like a force of nature than the final version. As far as apocalypses go, it works well.

I assume the other three would have been the equivilant to the Elemental Beasts. All things considered, they’re a bit more boring than the final versions. They just seem like generic monsters, with none of the flare the sets had.