Rider (Fate/Grand Order - Ivan)

Rider (ライダー) is a Rider-class Servant able to be summoned by Ritsuka Fujimaru in the Lost Belts of Fate/Grand Order.

Identity
Rider's True Name is Ivuan Kaminari tei.

Ivan as he appears in the Anastasia Lostbelt is the still-living person who has ruled as Tzar of the Lostbelt to present day 2018 AD. He is called the Thunderous Emperor.

Anastasia: Permafrost Empire
Ivan the Terrible was the ruler of the Russian Lost Belt, whose history diverged from that of Greater History of Man in 1570 AD when an asteroid struck and plunged the world into an ice age. Most humans died, and while Russians were used to the cold and prepared for such weather, 90% of their population perished and they were on the cusp of extinction. Ivan and his mages were able to save the country by combining humans with magical beasts, creating the Yaga, with Ivan himself becoming the first.

Abilities
As a Rider, his Mount appears to be a Gigantic Mammoth. He also wields electrical powers.

As a Yaga, he has merged with mammoths and saber tooth tigers. He constantly evolves and grows while sleeping, and after 450 years has arrived at the level of a Divine Beast. The Crypters say he is on the level of a Divine Spirit when comparing him to the Kings of other Lostbelts. Atalanta Alter states that his form is similar to that of what an Olympian god may look like based on her knowledge. Avicebron says "That is a Prime One from an ancient age before there were humans on this planet."