Raem Raem is a sadistic , metaphysical monster and the unseen main antagonist of " Final Fantasy Crystal Chronicles " . Its existence is tied to that of the Meteor Parasite in Mount Vellenge , and it feeds off the memories of suffering which the monsters spawned by the miasma produce , creating a never - ending cycle of pain and torment for the world ' s inhabitants . In this way , he is similar to Sin . It is worth noting that Raem is not only the final boss of " Crystal Chronicles " , but also the most powerful boss in the game . Story . Early History . Raem was born , along with Lady Mio , from the meteor impact that destroyed the great crystal and gave rise to the miasma . Both entities are apparently dependent on the memories of living beings for sustenance ; however , their individual palates diverge quite significantly . Mio desires simply to " nibble on memories from time to time " , leading to forgetfulness , while Raem consumes all the memories which he perceives , thereby eradicating all coherent thought and recollection . He seems to prefer memories focused on suffering and despair , particularly those brought about by miasma , and is willing to do anything to ensure that the miasma ' s source remains unharmed . This is due to the fact that forgotten memories , and those absorbed by Raem , are transformed into monsters which spread even more terror and anguish , creating a cycle to which there is neither end , nor escape . Confrontation . The Tipa Caravan ners meet Raem for the first time after the Meteor Parasite is defeated by them and they are taken to the Nest of Memories . Once there , the history and nature of Raem is revealed by Lady Mio , as is the fact that both Leon and Hurdy were victims of the being ' s insatiable appetite for painful memories ; however , he was dissatisfied with them , as they spent all their time looking ahead and giving little thought to the past . After a series of randomly - determined questions pertaining to the Tipa Caravanners journey , they reach Raem ' s domain in the Nest of Memories . The Tipa Caravanners are then imprisoned within a force field as he descends from on high . After Mio pleads with Raem on how he should only take bits of memories like her , he explains that being raised on memories and miasma give him a taste for memories of suffering and pain . Mio then shatters the force field around the Caravanners , however Raem uses his power to pin her to the floor and then the Caravanners are led into a battle with Raem . The Caravanners take on Raem in his original form and then after being defeated , forces Lady Mio to merge with him to become Memiroa . After delivering the final blow to him in this form , his last words are " Not yet ! Not . . " as he explodes into tiny pieces . Lady Mio is freed and the Caravanners are able to return to the Meteor Parasite ' s lair to deliver one final blow and finally free the world of miasma . Battle . Raem is fought in two different forms . His first form is his original form and his final form , called Memiroa , is fought after he is defeated the first time and forces Lady Mio to merge with him . Musical themes . When Raem is fought in his original form , the theme " Sad Monster " is played . During his second battle as Memiroa , the theme " Unite , Descent " plays .