heavy sci-fi armor 3d model

Bulky humanoid space soldier in heavy powered armor, full body, T-pose, arms slightly away from body, realistic proportions, not cartoonish, not chibi, not toy-like. Armor: massive segmented plates on torso, shoulders, arms, legs; wide angular shoulder pauldrons; armored boots; sealed helmet with narrow visor slit. Colors: matte black armor, blood-red trim on edges, joints, helmet lens. Details: sharp aggressive metal spikes on shoulders, helmet, back plating; exposed mechanical joints; weathered battle-worn scratched metal texture, grimdark military sci-fi. Weapon: rotating circular saw blade mounted on one forearm, integrated into armor. Style: grimdark sci-fi military, realistic hard-surface design, imposing brutal silhouette, game-ready 3D asset.