Imagine a 3D model of a 10th-century dark fantasy demon, towering, grotesque and fearsome, with gas-punk biomechanical enhancements. Its rugged red-gray skin cracked and veiny, lava coursing through its veins, harbors a complex gas engine, with brass exhaust pipes, pistons and whirring gears seamlessly integrated into its sinewy form, with a gas-punk mechanical arm. Inspired by Vallejo, Frazetta, and Brom, this demon is a terrifying embodiment of power.