 a monochrome manga illustration by tsutomo  nihei, science fiction, weapon, no humans, cloak, halo, holding.  The image is a digital artwork showcasing a futuristic, humanoid robot in a dystopian, post-apocalyptic setting. The robot stands imposingly in the foreground and background of the image. It has a skeletal, skeletal appearance with a dark, metallic exoskeleton. The robot's head is obscured by a helmet-like structure, with glowing, cybernetic eyes and a menacing visor. 

The exoskeleton is covered in a tattered, dark, and worn cloak that appears to be made of a durable, possibly synthetic material, with a texture suggesting it's been through harsh conditions. The cloak is torn and ragged, exposing some of the robot's mechanical components beneath. 

The robot's right arm is equipped with a large, futuristic weapon that resembles a cross between a rifle and a cannon, adorned with various mechanical components, wires, and glowing blue lights. The weapon has a distinctive, angular design with a red and blue color scheme, and it has a large, glowing red eye at the end.

The background features a desolate, industrial wasteland with crumbling buildings, rusted metal, and a smoky, misty atmosphere, indicating a post-apocalyptic setting. The sky is a muted, dark gray, and there are faint, glowing, science fiction, weapon, no humans, cloak, halo, holding, a monochrome manga illustration by tsutomo nihei