I've always had this thought: Caliburn is the only talking sword amongst the sacred swords, so why is that? My theory is, Caliburn once had a body, but his spirit was imbued into a sword at some point in his life. But with the help of the other swords and some High Ancient Magic, he can reattain this form if he feels the need/want to.
. She did an excellent job detailing his graying scruff and the armor!
In this form, he retains the same appearance he had before, an older man who is gracefully aging into his golden years. Caliburn is no different out of the sword than he is in it. Polite, yet somewhat snarky, mostly serious, but has a wild side to him under the right circumstances. His swordsmanship has become much more enhanced thanks to his experience as a sacred sword, and should he wield his own blade, opponents will meet a swift end.