Apneic Beauty

Apneic Beauty: 301 Second Ice Shrine of Eternity is a high-ranked Barrier Noble Phantasm utilized by Darius Ainsworth through an unknown Class Card. Letting the card sink into the ground, it generates an ice palace, a large dome of ice, that completely seals the area. It is strong enough to withstand punches from Bazett and a direct hit from Caladbolg II without chipping. It should be able to withstand any outside force, but Tanaka's unnkown power is able to open a hole in it. The user is able to modify it, allowing for properties like soundproofing it. The price for sealing off the area is that the oxygen within is gradually lost over 301 seconds starting from the invocation, and strenuous action affects those inside to the point of collapsing. The user is not immune, so Darius must cancel it before the oxygen concentration is reduced to zero.