Saber (Fate/Grand Order - Surtr)

Suruto (スルト) is a Jötunn of Norse mythology appearing in the Götterdämmerung Lostbelt in Fate/Grand Order: Cosmos in the Lostbelt.

Background
Sutr (also anglicized as Surtr or Surt) is a (Giant), the King of Muspelheim who brings the Twilight of the Gods during, burning the nine realms at the climax of the battle, after which the world is renewed.

Appearance
During the "Götterdämmerung" Lostbelt, Sutr appears as a gigantic flaming figure. After acquiring Fenrir's power, the left side of his body assumes an icy form.

Götterdämmerung: The Eternal Ice-Flame Century
In the timeline of the Norse Lostbelt, against the intended events of Ragnarok, Sutr devoured the wolf Fenrir, gaining immense power that thwarted all the gods. Instead of bringing the Twilight of the Gods as he was suppossed to, he chose to bring about the Twilight of the World. He killed many gods and the leading giants, until he was sealed inside a false Sun by Odin, who also died in the process.

During the final battle against Chaldea, Sutr was defeated by a combined attack of Sigurd and Brynhildr, after Napoleon managed to wound him with his Noble Phantasm.

Abilities
Sutr's sword is called Loptr Laegjarn (Loki Laevateinn): The Sword Of Flame Shining Brighter Than The Sun. It is described as a Divine Construct with absolute priority over living organisms possessing form and flesh, such that not even Gods of the Age of Gods would be able to withstand it.

During his initial manifestation in the Norse Lostbelt, he possessed and exhibited the abilities Monstrous Strength B+++, Branch Destruction (枝の破滅) A++, Giant Husk (巨人外殻) A, and Scorching Body (灼熱の体躯).

In the timeline of the Norse Lostbelt, Sutr, having devoured Fenrir and gained his Authority, became a Giant of Fire and Ice. Having inhabited Sigurd's flesh, he also inherited an aspect of Fafnir. After consuming the Fantasy Tree "Sombrero" he even usurped Scáthach-Skadi, as the King of the Lostbelt, and was very much a world-ending disaster.

He was capable of making use of the karmic bond formed with Ophelia Phamrsolone when the two made eye contact to hijack Ophelia's Servant summoning and inhabit Sigurd's body. He placed a curse on her when he was summoned, which when triggered would leave her no choice but to witness the end of the world at his side.