Master of Rider of Black during the Great Holy Grail War, Celenike was born in the Icecolle family, a fairly old bloodline of practitioners of the dark arts. The Icecolle were forced on the run by the devastating witch hunts of the Middle Ages. They escaped from western Europe all the way to Siberia, they lost the foundation of their thaumaturgy and eventually fell into decline. Celenike was the first child to be born of the decaying bloodline in a long time. Her elders, who devoted their lives to perfecting the dark arts, doted upon her and poured every teaching they had into her.
A sadistic female magus who runs a business killing others with curses. The only Yggdmillennia scion to place her own benefit above that of the clan. Celenike also had the most vindictive personality among the Yggdmillennia clan.
During the final stages of the battle between the Red and Black Factions, Celenike appears on the battlefield, confronting Rider and Sieg. Enraged by Rider showing care towards Sieg, she uses her Command Spells to force Rider to attack Sieg, with Rider barely being able to resist. Before Celenike can use her final Command Spell to force Rider to kill Sieg, she was decapitated by Saber of Red, who kills her simply due to disdain towards her.