Eldest Sister of the three goddesses that govern fate, Hrist is Lenneth's older sister and mistress of the Past. She is known for her ruthlessness and her loyalty to Odin. She despises humans as she feels they are but slaves to the gods. Hrist appears only twice in the game. First when you travel into the past at the Lost City of Dipan, where she is seen with earlier incarnations of Mystina and Arngrim. Then again at the Weeping Lily Meadow during Ending A where she takes control of Lenneth's body on Freya's order. Hirst has quite a grudge against Brahms, the main reason for her hatred stems from the fact that he also holds her youngest sister Silmeria captive in his palace.
Hirst isn't necessarily evil, but she is always serious and always in command. Odin placed her in charged of governing the past, during which she fought a war similar to the one Lenneth fights now, but Hrist fought a war verses the Undead and Brahms as oppose to the Vanir.
The details on how Brahms came into procession of Silmeria is not made clear in the game, but Brahms now keeps her in his trone room and hopes of luring Hrist to concluded their fated battle. During Ending A, per Freya's order, Hrist takes over Lenneth's vessel and goes to fight Brahms. But because Lenneth's vessel can not convey her true powers, she is easily defeated.
Hrist is not a playable characte, but in the Seraphic Gate, you can fight her in what could loosely be considered her true vessel. She is located on the last level and is the final roaming encounter before you reach Iseria Queen. Below is Hrist's attack list and the damage numbers you can expect when you encounter here in the Seraphic Gate.