虚数潜航艇 シャドウ・ボーダー
The Imaginary Numbers Submersible Shadow Border is an [[armored vehicle]] built by Chaldea Security Organization.
It is the primary means of transport utilized by Novum Chaldea to traverse the Lostbelts in Fate/Grand Order: Cosmos in the Lostbelt.

Not to be confused with [[vignetting]].

h4. See Also
* [[Storm Border]]

h4. External links
* "Type-Moon Wiki: Shadow Border":[https://typemoon.fandom.com/wiki/Shadow_Border]
shadow border