Śūnyatā

Śūnyatā (Sanskrit: शून्यता, Shoonyata), also known as Boundary of Emptiness (空の境界, Kara no Kyōkai), is the name Bellerophon gave to the shield that currently houses Dimension Lost.

Appearance
It appears as a large, round shield

Abilities
As it serves as a housing for the Top-tier Longinus Dimension Lost, when activated Śūnyatā  is capable of channelling a fraction of its power by emitting a thick layer of dark reddish mist in front of it, effectively allowing it to block and transport any attack that comes into contact with it.

Weaknesses
Because of its nature, the true power and Balance Breaker of Dimension Lost cannot be utilized, which means that sufficiently powerful attacks can cut through or disperse the mist. Furthermore the mist can only be generated from the front of the shield, making it useless against attacks from behind and the flanks.

Should a sufficiently powerful attack crack the shield, the Sacred Gear within would be released and automatically reenter the cycle of reincarnation.