Guardian ( Final Fantasy XIII - 2 ) In " Final Fantasy XIII - 2 " , Guardian is the title bestowed upon a warrior from a Farseer tribe tasked with protecting the seeress Paddra Nsu - Yeul from harm , given the mark of a l ' Cie to ensure no failure . There can only be one Guardian any one time , and every warrior who shows potential must kill the present Guardian to succeed him . The last guardian is Caius Ballad , made immortal by the Goddess Etro and gaining a new objective in his role by remembering Yeul ' s visions , thus retaining memory of all timeline events . Datalog . " The warriors who accompany and protect the seeress Yeul are chosen from among the most capable of the Farseer people . " " A Guardian is the strongest of these , a defender that wields the power of chaos . This power is said to surpass even the godlike might of the fal ' Cie . " " Only one true Guardian is permitted to exist at any one time . Another protector of the Farseer tribe who challenges and defeats the champion becomes the new Guardian and wielder of chaotic energy . " " The Heart of Chaos does not grant the Guardian power — it eats away at their physical self . Caius did not gain an immortal body , but was cursed with eternal life . " " Heed my words , Noel . You are the last protector , and the only one who can wrest the Heart ' s strength from Caius . In the instant you strike the life from his body , you shall either inherit the curse , or break its eternal grip . Only your will can slay fate one way or the other . " Story . One notable Guardian was Gorgyra , a girl who chose to become Yeul ' s guardian . She was once fooled and in turn the seeress ' s life was put in danger . Although Yeul forgave her Guardian , Gorgyra was not able to forgive herself and requested to become a Cie ' th as punishment . Caius was made a l ' Cie tasked with the Focus of protecting Yeul after killing his predecessor . When her life was threatened by an army invading Paddra , Caius risked his own life to protect her by performing an incarnate summoning , where he fused with his Eidolon , Bahamut . Doing so cost Caius his life , but the goddess Etro saw Caius ' s dedication to Yeul and took pity on him . She freed him from his l ' Cie fate and gave him her own heart , the Heart of Chaos , thus making him Yeul ' s immortal Guardian . This act would become a curse of eternity that would cause Caius to descend into madness through the centuries that follow . He would continue to protect hundreds of incarnations of Yeul and remember their visions of the future , waiting for the day someone strong enough would surpass him and release him from the curse . At the end of days in the Dying World in the year 700 AF , Caius ' s prayers were answered with the birth of Noel Kreiss . He becomes Noel ' s mentor and close friend while training him for the day the boy would be strong enough to defeat him . When that day comes , Noel does not wish to kill Caius but instead serve as Yeul ' s Guardian alongside him . Caius engages Noel in battle and emerges the victor much to his dismay . He abandons Noel and Yeul , seeking to free the latter from her curse as a seeress by going to Valhalla , the middle world betwee life and death , and killing Etro . After the goddess opens her gate to Noel and sends him to Valhalla , he meets Lightning , Etro ' s protector , who sends him back into the past to find her sister Serah . She and Noel begin their journey through time together and learn she can also see into the future like Yeul , thus in a way granting Noel ' s wish by making him Serah ' s Guardian . In a paradox ending Noel inherits Caius ' s Heart of Chaos and succeeds him as Guardian .