Warhammer 40k Ultramarines Primaris Space Marine in dynamic combat pose, wearing Mk. X Tacticus power armor with detailed Aquila chestplate, pauldron heraldry (gold trim/ultramarine blue), and a plasma pistol. Battle damage on armor edges, grimdark weathering (oil stains, scorch marks), PBR materials (metallic ceramite, matte cloth). High-poly details, 8k textures, optimized for Unreal Engine 5