Wrought have a chitin-like feature on the bridge of their muzzle that can be genetically coerced into a multitude of forms. Some crests are even entirely comprised of picotech or artistic materials.
They can have various functions, cultural, sexual, technological, aesthetic and more. Most Sen use a variety of energy wave focusing multi-layered crest that enhances their perception of electromagnetic fields,
by concentrating signals to and from their modem organ (snoot)

Very few wrought indivuduals look the same, some have no crest, others have extremely wild configurations that move / glow / display