A trophy artifact obtained in battles with Murmur. It resembles a chitinous cocoon with resilient translucent formations that look like the respiratory organs of fish. These formations slightly "open" and absorb oxygen from the surrounding environment. When in proximity to a large living organism, it begins to form a transparent slime with a strong odor on the organism's epithelial surface, which is instantly absorbed into the skin without a trace. Samples of the slime contain microorganisms—a bacterial colony of unknown nature.