Started as a typo long ago on an obscure mailing list, the 'scree-fise' have developed into a modern myth.
Scree-fise are an invading alien race. To survive, they need certain human body parts, most notably, kidneys and eyes. Corpses are often found missing these body parts.
Scree-fise reproduce by laying a parasite into a host, which takes over the host and turns it into an adult scree-fise. This takes time, however; within one month, the parasite can be removed by simply kicking the parasite sharply. After one month but before three months, the parasite may be removed with surgery, and with lasting side-effects similar to Type I diabetes. The parasite is unremovable after three months.
Scree-fise also have a 'lig form, which is a eight-full tall killing machine with a mouth full of razor sharp teeth. It is believed that changing from normal adult to 'lig form is irreversable; other forms (such as piscine or centipedal) are rumored but not confirmed.
Scree-fise biology is suspectable to an indiverse number of acids and other compounds; luckily, these are concentrated in a good strong mango tea. In fact, if frequently drunk, the scree-fise will not be interested in you as a victim, for it makes your system dangerous for consumption or egg laying.
Unfortunately for humanity, the Scree-Fise have had enough time to insinuate theirselves in positions of power, such as CEOs of media corporations and political bigwigs. They are using this to hide the fact of their existance, and their movements are for now unknown to humanity at large.
Scree-fise have also been featured in Omlevex Comics.
Beware, my child. The scree-fise run wild tonight, and they come for your eyes and kidneys.