A semi-mechanical monster that fell dormant to Earth about 10 years ago. Grigio Raiden has a huge cannon on its back and feeds on scrap metal and other garbage to replenish its energy supply.
There are traces of genetic manipulation, and it is speculated that it may be a biological weapon. The STORAGE robots were developed based on data from this monster.
Height: 60 meters
Weight: 720,000 tons
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