Obsidian humanoid in neon cube holding glowing heart

A digital art portrait of a muscular humanoid figure with glowing white eyes and dark obsidian skin composed of cracked stone tiles; the subject is encased within a transparent cube frame lined with bright red neon grid lines that glow against a deep crimson background; holding an ethereal, luminous heart in both hands which pulses intensely like electricity before melting into long viscous tendrils dripping down its torso. 

Subject: A powerful humanoid figure featuring glowing white eyes and dark obsidian skin composed of cracked stone tiles resembling broken glass or basalt rock plates fused together around the face and body; wearing a sleek armored bodysuit that mirrors this jagged crystalline texture with sharp geometric edges along shoulders, arms and chest plating. 

Action: The subject stands in an upright pose gazing forward while cradling its glowing heart gently within cupped hands positioned at mid-chest level where the light emanates from between palms; facial expression remains stoic beneath cracked mask-like features as liquid energy cascades downward from the radiant organ onto chest armor creating dramatic visual flow. 

Environment: Set inside a high-tech containment cube constructed of clear glass panels illuminated by vivid red neon grid lines forming perfect rectangular framework surrounding figure completely while floor reflects ambient glow upward toward lower torso area enhancing overall sci-fi atmosphere; scattered white particles float softly throughout space adding depth and mystical quality to composition. 

Lighting: Dominated by intense internal luminescence radiating outward from glowing heart source casting soft shadows across cracked skin texture while outer rim lighting highlights translucent glass walls of enclosure creating subtle refractions along edges; cool blue-white tones contrast sharply against warm red ambient glow bathing entire scene producing cinematic mood emphasizing emotional intensity through color interplay. 

Style Details: Rendered with hyper-detailed digital painting techniques combining photorealistic textures (glass reflections, stone cracks) and fantasy elements (glowing core energy); employs strong chiaroscuro effects to emphasize three-dimensional form within confined space while maintaining clean lines typical of modern concept art style suitable for game design or comic book covers.