[Arzu's Double Cross], the magic most famous for creating the Demon Hunter group, and also most notorious.
The giant monster [Saliva Demon] summoned under the Double Cross Array crushed half of Maribo City.
The outside world assumed this magic would be some kind of powerful summoning magic.
But when Lann visited Ker Morhan, the original base of the Demon Hunter Order, he was allowed by Vesemir to enter the oldest and darkest rooms of the castle to read the knowledge and wisdom within.
With Mentos's comprehensive understanding and computational ability, Lann successfully replenished the knowledge lost when the Bear Demon Hunters split from the Order, including the Demon Hunter's potion alchemy, the advanced forms of the five Magic Seals, and so on.
He also pleasantly and keenly discovered the true nature of Arzu's famed magic—
[Arzu's Double Cross], releasing this magic independently holds no meaning; it is also not any 'powerful summoning magic.'
