They cannot exactly tell how strong he was, but it definitely reached true god level; otherwise, the angel blood within them wouldn't react.
Not to mention he was a member of Sky Tower, a very powerful ancient force that remained working even after Rion regressed.
If they could draw him to their side—even temporarily—then the coming expedition would shift entirely. The dangers of the Necros Continent, a land of death and shadow, would be far easier to face with someone of his calibre.
For the princes of the Sacred Light Empire, it was not just an invitation. It was a calculated gamble.
All three of them now looked to Apollo, waiting for his answer.
"Hmm." It was new, as he didn't expect that he would be invited to join them. Not to mention their target was on the Necros continent.