Speaking of Morgan I found the naming of her Rhongo magic and Artoria's Excalibur magic quite interesting:
Specifically 霊脈 (leyline) on Rhongo vs 龍脈 (also leyline, but more often used in Chinese myth i.e Fengshui, literally means dragon stream/vein) on Excalibur.
I remember these 2 terms being used interchangeably a few times before, but in this case they are used like that. It can be just a naming choice to differentiate Artoria's one (as she has the heart of the last dragon -> dragon stream), or something else. Interesting nonetheless.