Sisters-Vedims. Sister of the night

Vianna and her sisters managed to break out of the captivity of the Supreme King, but the danger that threatens the world of people did not pass. The demon"s revenge will be terrible, a new blow should be prevented immediately.
Every day, regulus acquires more and more power. In his hands, coins of abundance and Samaria are a metal that makes the enemy an enemy immune to magic. The antidote should help to turn the tide of the battle, that only witches can make.
But the plans collapse: the ancient Grimoer, the family book of spells, opens the mysterious ancient prophecy to the witches. And now Vianna has to go a half millennia ago to solve the message. Perhaps it is there that is the key to the salvation of the future of the whole world