Kathfar

The Kathfar Empire were an artificially-created Kardashev Type III civilization which inhabited Kepler-90i millions of years before the start of humanity. They were driven to extinction by Emanuel Fialik. Falco Richter, Rammstein's very first manager from 1994 was the final living member of the Kathfar species, before committing suicide after realizing his failure to defeat Fialik.

Connection to Emanuel Fialik
Many millions of years ago, Kepler-90i was bombarded with deep-space comets. Locked inside the ice of one of these comets was Fialik's frozen body - Fialik had climbed in to the forming ice of a comet a few million years before it crashed on Kepler-90i's surface in order to hitch a ride to a random civilization.

After crashing on Kepler-90i, Kathfar residents of a nearby research station (Outpost 32) retrieved the chunk of the comet which contained Fialik's body. That night, while the researchers were sleeping, Fialik exploded from the containment of the comet and began to assimilate the Kathfar researchers, one by one. It later went on to drive the entire Kathfar species to extinction after reaching their nearest civilization. It is presumed that it did this through the use of his most common tactic; musical hypnosis.

Fialik left Richter, the final Kathfar to die. Before committing suicide in defeat, Richter wrote a suicide message in his own blood on a slab of sandstone on Earth - this stands as the final text written by the entire species.

Biology
The Kathfar were synthetically seeded by a precursor species which are said to have once been a great space-faring civilization which gave life to all living things in the universe, including Emanuel Fialik itself. The Kathfar were a sexless (and by extension, asexual) hybrid species, the result of millennia of genetic modification. They were extremophiles which could tolerate all sorts of conditions which would kill most other life forms.