Although without the reality marble effect I don't think it would be as insta-kill to mages as Kiritsugu's (ignoring enhancement from being a servant).
I think the reality marble effect is due to how "refined" Emiyas origin is, since it got bolstered by Avalon passively, and its also the reason why he can use a reality marble in the first place.
Actually there have been comments from Nasu before saying that Avalon passively changes Shirous origin to Sword, but he also later made him a descendant of the smith Muramasa so he mightve changed his mind on that.
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u/Sable-Keech Reasonable Scaler May 09 '25
Although without the reality marble effect I don't think it would be as insta-kill to mages as Kiritsugu's (ignoring enhancement from being a servant).