@edbone クラス: ルーラー (セイバー) Class: Ruler (Saber) or IOW her class is "Ruler"(special class like Avenger?) but can be alternately summoned as "Saber"
To compare, Siegfried is Saber but can be Rider and Karn(a?) is Lancer but can be Archer or Rider. OTOH David and Atalant(?) are exclusively Archers, Benkei is Lancer only, etc