Here are some mood sketches and architectural researches I made for the boss room in the Mines of Absolver: Downfall. ©Sloclap
Art Director - Paul-Emile Boucher: http://inatma.fr/
You can have a look at the work of the environment artists who worked on this project here:
https://www.artstation.com/clementmasset
https://www.artstation.com/marwanghandri
https://www.artstation.com/rhinh