This is... the Sigil of God's Will!
Nightingale widened her eyes in surprise. But soon, she found something different. Through the Mist she saw a black hole formed in the enemy's palm instead of the characteristic dazzling light of the Magic Stones. It was not a sigil but an ability of the demon. Shining magic power was sucked into the black hole and became a fast-growing vortex which gave off such a strong light that it made it hard for the other witches to open their eyes. However, seeing it through the Mist, it was getting darker and darker.
The demon then thrust its sword into the ground, sending out a black shimmering light to cover the entire woods.
