The richest Red Iron Ore reserves on the Alien Planet are truly inadequate.
But although the material is lacking, as long as it's thick enough, it can block a lot of damage. After the appearance of the metal tombstone, Wugang Pengshen, who was already capable of launching nuclear weapons, abandoned using them.
Crashing into walls to blow itself up? It wasn't that stupid.
When facing the ground destruction caused by the tungsten steel weaponry of the Prince Mecha, the Pillar Compass can actually hold out for a while before the Prince Mecha damages it to the region where the drive bearings are located.
The reason Ji Rongxinyue chose it as a target is simply because it's far enough from the other four Prince Mechas, and its serious appearance of ground destruction made it impossible not to want to kill it.
