Caldron

A walking black volcano, Caldron is incredibly strong and tough, and can project lava from his body. Transformed by a fall into a volcano while serving as a soldier for the terrorist agency Forefront during a raid by SHIELD agents, he was left alive but trapped in this hulking new form, eventually deciding that villain mercenary work was the only life left for him to lead, as he'd lost all chance to be a part of society any longer. He takes out his frustrations with his tragic life on unfortunate supers that cross him, and searches for someone or something that can turn him normal again.