Mucranoid

The Mucranoid, also called the Weaver, is one of the 19 gene-seed organs implanted within a Space Marine Neophyte to create a new Astartes. This organ is implated within the central nervous system and responds to specific chemical stimuli in the environment, causing the Space Marine to secrete a waxy protein substance similar to mucus through his pores that seals his skin. Space Marines are cocooned in this way before they enter suspended animation, and the process can even protect them from the harshness of the vacuum and other extremes of temperature, particularly deeply frigid environments.