The Necromorph Membrane is a grotesque, organic material that appears as a thick, pulsating layer of flesh with a slick, wet surface. Its texture is uneven, featuring raised veins and sporadic, tumor-like growths that glow faintly with a sickly green bioluminescence. The membrane's edges are irregular and torn, suggesting a violent formation process, and it adheres to surfaces with a sticky residue, reflecting its alien and parasitic nature.