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I’ve seen on the internet people trying to figure out what sword this was. Certainly the name of it would be in the files somewhere right? Did he get it in a deleted cutscene? Is it from DotF, did he use that to take out Bahamut with?
this is from wiki fandom
Sword of the Father
"The Windows and Royal Editions have a boss battle against the Mystic, whom Noctis finishes off with a sword that he doesn't normally have: it has a similar yet truncated blade as the Sword of the Father, and a different hilt. This is actually the sword that King Regis had in the Dawn trailer. Promotional art that accompanied the trailer (see Gallery) shows Regis with the Sword of the Father, implying the "Dawn" (sword is perhaps an early version of it.)"
about dotf and bahamut i should check more
This is from the same source dawn of the future
"Noctis gives Ardyn the "battle of kings" he so desires, defeating him with the Sword of the Father, but to Ardyn's shock refrains from killing him. Noctis explains he would kill Ardyn if it saved the world, but now that Bahamut is going to kill everyone, there is no longer any point, and he is done with needless sacrifices. He asks if Ardyn defeating Bahamut in the Beyond would save humanity, and though Ardyn thinks it might, he doesn't care about being a savior: he only wants vengeance. Even if Noctis cannot forgive Ardyn, he views his nemesis a part of the world that he swore to protect, and recalls how the Mystic had asked him to save him."
Certainly there are better sources. If I mistake, I am sorry. If I remember or know more, I will tell you..etc.