[@Taka] - Welcome! As [@Lemons] said, Excalibur is one of those that is taken so to speak, though I quite understand the love for the blade. :D Can do what [@n0cturnal1] did and grab one of the other items that King Arthur wielded (Clarent is also off the table I'm afraid). But there is Pridwen and Rhongomyniad. Also [@Burger] made a decent point - if it's Excalibur from say Final Fantasy or Sword Art Online, I'm fine with that, but it would be known in character and out of character as not being [i]thee[/i] Excalibur (so the one from Fate wouldn't do, sadly).

[@TruthHurts][@n0cturnal1] - No, that's not the case, so Caliburn couldn't be used either, though I understand the thought!