How did he know her real name though? Did he go through Serah’s memories or something?
everything, when you become a l'cie you’re basically a slave for the fal'cie
He was literally the head of the Sanctum. Lightning was a member of the Guardian Corps, A Sanctum military division. It would be cool to think he knew by going through serah’s memories but Serah’s fal’cie was Anima, not Barthandelus. She wasn’t his slave. There are a million different ways he could have learned her name lmao
obv he learned throughout the fal'cie gossip whatsapp group