Once Caius acknowledged Noel strong enough to become Yeul's guardian, he left for Valhalla to go through his resolve to free Yeul from her fate of endless reincarnation by unleashing chaos and killing Etro, thus destroying the past. In response, Lightning was taken by Etro to become her guardian. They were seen to be fighting at the gates of Valhalla. - #FinalFantasyXIII #LightningReturns #Caius #Lightning