In order to invade the Invizimal's world, we must send in miners, to dig and extract the Invizimal energy we desire. But these miners can't be weak or frail: they must tower like metal mountains, designed to dig, but also to keep away Invizimals attacks. Blastfurnace is thus strong, but fearsome. Not very intelligent, that is true. But you can't have everything, especially if you want to build it cheaply.
