Holy Sword of the Ice Palace

The Holy Sword of the Ice Palace (氷宮の聖剣, Hyōkyū no Seiken) quest is the final quest that involves King Artoria and could be considered a prequel to the story of the Blackened Camelot Singularity.

Initiation
Shiota and the KoB received notice from Sir Lancelot, explaining to them that the king's traitorous son had stolen and made off with the king's sword. Shiota and co rush immediately to King Artoria's castle who is suiting up for battle. She leads them until they reach Camlann Hill.

Location
The quest itself involves the entire land of Camelot. The climax of the quest is at Camlann Hill where the boss of the quest, Mordred, is hiding after successfully stealing King Artoria's holy sword.

Objective
The quest's objective was to find the traitorous knight who made off with Excalibur and either force him to return it or kill him then retrieve the weapon.

Known Attempts
This quest is a one-time only quest and it was cleared by Shiota and the KoB. It was this quest that brought Shiota and the KoB to the attention of Shamrock.

Trivia

 * The quest name is a metaphor that describes the cold feeling of the Camelot castle after the death of King Artoria.