Mecha, no ordinary mecha. That blazing orange core, emanating tremendously surging heat, constantly scoured the icy night sky, like a scalding branding iron dropped into the snow, evaporating the frozen world.
Although they were both called mecha, such a machine and the stony steel creations on the ground were fundamentally different, merely the nuclear reactor burning in its chest was enough to light up the entire night sky. If it were to completely explode, annihilating this ruined city would be no problem, because it itself was a functioning nuclear fusion reactor.
A true Seventh Rank mecha could shuttle through space, its sturdy frame could move through nuclear explosion shockwaves, as long as it wasn't a nuclear bomb exploding in close proximity, that sturdy armor could withstand the external shock and damage.