This is the very first assignment I had at this job. The idea was a miniboss that would guard certain checkpoint areas. It didn't end up fitting with the direction we would later go with the enemies, but we justified that by saying that it was some sort of unrelated alien/interdimensional creature that got trapped there.
Some of these concepts are paintovers of 3D models by Nestor Villegas. https://www.artstation.com/3denvy My art director for these was Ben Zweifel. https://www.artstation.com/benzweifel