|Holotome Profile: Spiral Mark|
The Spiral Mark, located in Siberia, is where the Nullifiers were sealed beneath a large symbol of the Blood Spiral by Lord Casterwill. It can only be re-activated through the Willblade, combined with Void, on the longest night of the year while the Red Comet is on the sky.
After Lord Casterwill defeated the Nullifiers, he sealed them in the Spiral Mark using the Willblade of his elder daughter. After his death, his best friend, later known as the Betrayer, tried to open it again with Void on the longest night of the year. Casterwill's children defeated him and from there on the Casterwill family's purpose was to never let it open again.
Lok Lambert and Sophie Casterwill, however, activated the Spiral Mark by mistake, having been led to think that Willblade would prevent Nullifiers from returning to Earth, though this was planned by the Betrayer himself eons ago.
Even though Dante Vale destroyed the Red Comet, the Betrayer revealed that he could actually use his own powers to open it and bring the Nullifiers back. Lok invoked two Legendary Titans, Quetzalcoatl and Pendragon, to defeat Demigorgan. Though the Betrayer was seemingly defeated, the Spiral Mark was still active.