The Worldbreaker is the main antagonist from the Marvel comic The Unworthy Thor. He’s a powerful destroyer, who wants to make Earth and all other worlds his dark kingdom ruled by pain and punishment. Well he died in battle in this series but with magic it’s possible he could return to life again and continue his fight for destruction. If not that at least there are many characters that have taken the name since him who would be more than happy to torment Earth if they got the chance.