User blog comment:SpookyBoogie27/Light Novel Spoilers/@comment-71.190.146.213-20140207022346/@comment-1359322-20140212053108

Like i said, the author never really stated who is stronger between Ophis and Great Red. And Ophis never asked for anyone's help to defeat Great Red. The people with evil intention that gathereed around Ophis promised Ophis that they will defeat Great Red for it. So, Ophis agreed to help them that's all.