Longdan

The Longdan (竜胆/龍蛋, Rindou, lit. Gentiana or Dragon Egg) is pyramid-shaped land-cruising mobile fortress controlled by the Chinese Federation, capable of deploying dozens of Gun-Ru Knightmares. It has two large cannons and thirteen smaller cannons. Certain models are equipped with tank treads for land mobility, while others have hover systems to levitate across bodies of water. The Longdan's large cannons are comparable with the real-world Schwerer Gustav guns, which were used by Nazi Germany during the Second World War.

Design and Specifications
Not much is known about the interior of the Longdan but what is known is that there's a control room located presumably in the center of the fortress which has a large table in the middle with a monitor that designates both allied and enemy forces and is used to monitor the battlefield during battles. It also has many computers and consuls as well and it's where soldiers go to drive and monitor the Longdon. On the outside lies many large cannons and guns to be used against enemy forces.

Operational History
The Longdan first appears during the Battle at Xiaopei where it commands the Chinese Federation forces during the battle after it was captured by Chinese Federation loyalists from Li Xingke and his rebel forces. It oversees the battle and later arrives at the Mausoleum of Eighty-Eight Emperors where it also oversees the battle there and open fires on the Shen Hu after the Shinkiro protects it from loyalist forces and is later damaged by the Shen Hu when its used to break a hole in the command center so that Xingke can enter and execute all of the High Eunuchs. Later on, it's sued by the Black Knights as part of the military force for the United Federation of Nations and appears during the Kagoshima Settlement Battle as part of the main invasion force.