Saber's True Name is Lancelot, also known as the Knight of the Lake, the person serving as a negative symbol of the Arthurian legend. The "Knight of the Lake," admired as the strongest even among the Knights of the Round Table. He was extremely loyal to King Arthur as one of the Knights of the Round Table.

Lancelot, along with the other Knights of the Round Table, is summoned by the Lion King in the "Camelot" Singularity. The Lion King gives them the choice to either aid her in her "Holy Selection" or side against her, giving them a half a day to decide. Lancelot, although he was loathe to admit it, realizes that the Lion King is making the best out of a bad situation, deciding to side with her, along with Gawain, Agravain, Tristan, Gareth, and Mordred. They then kill their former comrades and form the Knights of the Lion King. He receives the Gift of "Ferocity" from the Lion King, due to vowing to ascertain the situation as a person, not martyring himself to justice.