Who is Wyrmen from Perdido Street Station and what is their importance?

Wyrmen are strange, secretive creatures who possess a kind of special insight into the cryptic levels of nature and physics. Their primary purpose is to make water sculptures by harnessing crisis energy in water molecules. Isaac gets an idea for a crisis engine after seeing their work and hopes to use it to power a set of prosthetic wings for the Garuda named Yagharek.