Lazarevs and the Rat's Lair

Lina and Savva are gifted with the gifts of destruction and healing from birth. This happens very rarely and such people are considered the strongest among all, which Kaan really did not like - a villain who has been destroying gifted children since the 18th century in order to restore equality among witches and witchers.
He is very cruel and powerful. In his entire life, Kaan killed 15 children without even batting an eyelid. While he was alive, everyone was afraid of him. Some people tried to resist the villain, but were defeated.
After the death of Kaan, everyone calmed down, only now, gifted children were no longer born.

And now, centuries later, Gleb Lazarev and his wife Anna gave birth to twins. A boy and a girl, because of which Kaan himself has risen from the realm of the dead and is going to kill the unsuspecting, Lina and Savva.