Saber (セイバー, ), Knight of the Sword, is one of the seven normal Servant classes summoned for the Holy Grail War and considered one of the Three Knight classes along with Lancer and Archer. Servants placed within this class are agile and powerful melee warriors adept at swordsmanship. The qualifying conditions require the Heroic Spirits to have legends as a knights of the sword, and it is the class that requires the highest levels of attributes in all but the Magic attribute. The Saber class has, without fail, proceeded to the final battleground in every Holy Grail War, so it is boasted as the strongest among all classes.

Servants of this class have high ratings in all categories, and the compatible Heroic Spirits usually excel in delivering powerful burst attacks. The Class Abilities include the strongest Magic Resistance of all classes, and the Riding ability like the Rider Class.

Fate/hollow ataraxia (フェイト/ホロウアタラクシア Feito/horō atarakushia) is a Japanese visual novel game created by Type-Moon in 2005 which is the sequel to its earlier visual novel Fate/stay night. The word ataraxia in the title is a Greek term for tranquility, giving the title the combined meaning of "empty (or false) tranquility".

The game will also be ported to Playstation Vita, and will include full-voice acting, among other enhancements. It will be released in Japan November 27, 2014