The massive Mobile Fortress Vajra is designated "Bishop" and like all vajra vessels, the craft is a living spaceborne organism. This enormous ship - a class of some 10-20 kilometers in length - servres as a nest for the Vajra Semi-Queen. These mobile fortress nests are defended by multiple layers of bio-energy conversion armour and armed with bio-heavy quantum beam guns, possessing a fighting strength equal to that of several Heavy Battleship Vajra.