The serodromi's skin is made of a strong latex layered around a supersaturated fluid. Upon breaking through the skin, the fluid quickly crystalizes, releasing intense heat and breaking into flakey pieces. This destroys the skin and the stranger in the process. Its internal fibers contain long, complex protein chains, similar to immense ribosomes, surrounded by a slurry of glucose, amino acids, and fatty oils (which cool into a solid wax at room temperature). These oils hold the replicated blood inside soapy bubbles.