C2165 The Gathering of the Divine Kings
To be called a heaven-defying king, one must not only be able to fight against opponents of a higher level, but also be a top-tier godking among those of a higher level. Only then would one be called a heaven-defying king.
For example, King of Change could contend against the three King of Change who were at the bottom, but he was not called a heaven-defying king