Create a highly detailed and realistic image of a dark grey Decepticon mech, inspired by the art of Eugeen Van Mieghem and Greg Rutkowski, with a focus on intricate greeble details and cinematic lighting. The mech should be 1km tall and posed in a dramatic, epic manner, evoking the style of the 'Master of Puppets' and 'Predator 2'. Incorporate elements of a carneval outfit, but maintain a dark and ominous tone, as if the mech is the 'ultimate gigachad' from the world of 'Overlord'. Ensure the image is rendered in a hyper- realistic 3D style, with a high level of texture detail and adherence to the golden ratio. Output should be a high- quality, 2D image with a cinematic feel