The Nocturnus Clan (ノクターン一族 Nokutān Ichizoku?), also known as the Marauders (マローダー Marōdā?) or the Fourth Great Civilization by the archaeologists on Earth, are a long-lost nation of echidnas who appear as the villains in Sonic Chronicles: The Dark Brotherhood. Their leader is Imperator Ix. Professor Gerald Robotnik was the first to propose that the Nocturnus Clan had ever existed after the clan had disappeared for millennia.