The Zanki Barrier(斬輝結界Zanki Kekkai, Light-Cutting Barrier) is a unique type of Ars Magus that can only be performed by wielders of the Sealed Weapon: Izayoi. Tsubaki Yayoi is shown to be the sole practitioner of the technique. Somewhat similar to an Eclipse Field, the Zanki Barrier has the ability to stop any interference with the world outside of it. This is one of the multitude of reasons that the Sealed Weapon has gained legendary status, as not only is the barrier completely impenetrable, but not even Observers are capable of witnessing the events that unfold within it.