Synean is the race that inhabited the planet Krenus before their supposed extinction.
They communicated through sound. They recognized cracks, inlays, etc., but not colors. Therefore, all their objects were not coloured, unless the material they used was coloured.
The weapons and objects they used were based on sound waves and music was their main form of art.
Their buildings on the planet have no windows, only cracks to let air and oxygen through.