Not all the entrances and exits have five gates that can hold Ji Xinghe and Ji Rongxinyue for a certain time; the specific structure relates greatly to the terrain of the Mountain of Gods, but these sealed gates significantly hinder the Federation's offensive forces.
Those automatic and remote fire output points aren't easily destroyed by the Federation's intelligent machinery attacks, and the mechas that forcefully advance into the passages, despite using giant shields forged from superalloys, cannot guard against the various bombs hidden among the debris targeting the Federation's various penetrating weaponry, including mechas.
