Question about Ascendant Order and High Isle chapter.

So Zenimax said that High Isle won't have any big godlevel threat to the whole world. I can't buy the chapter yet, but I'm too curious to know - is that true? Who is the ascendant lord - a mere mortal with some new source of power? Or is he empowered by some higher being? You can spoil everything I guess, but that's not required.