Transform into an Armed Mecha at the Beginning, I Can Plunder Everything

When Bai Suiyu was celebrating the New Year at his grandfather's house, he accidentally fell into a strange space surrounded by volcanoes. After he ran into a terrifying monster that could control flames and magma, he was swallowed by high-temperature lava and nearly died. On his deathbed, Bai Suiyu entered a magical space and gained the power of "plunder" and "immortality" as an armed man. Just to prevent people's lives from being unreasonably deprived, Bai Suiyu chose to fight. Armed Man, Machina... Bai Suiyu will continue to plunder during the battle and will gradually know the truth of everything. (No system, passionate battle, tokusatsu-like text)