Karzahni is located just south of Metru Nui. It is here that damaged Matoran were once sent to be repaired. However, the repair work done here was extremely poor, and, to hide this fact: such Matoran were either sent to the Southern Continent, or imprisoned on the island itself. The Matoran here perform work that is both meaningless, and grueling. They are all in horrible disrepair, and are often forced to create useless objects that serve no purpose. Such objects are immediately destroyed in front of their creators, who are sent to create the same thing again. Upon noticing that Matoran who are sent here don't come back -- Matoran have stopped being sent here, and instead repair themselves.