First-called Ilsa. The First Dead Princess. Immortals

So, Elena the Beautiful, the ruler of the Kingdom of the Dead, puts the daughter of the Magi Ilsa as her assistant. Elena herself finds her missing twin brother and must leave. And the First-Called One has to reason with the Fallen, throwing them into Tartar, and collect and protect the Siberian lands, and at the same time be able not to exterminate all the rebellious. She had to survive many battles, the death of the groom, and give a new Truth for the Siberian Lands.