User blog comment:Pualover/Overlord Power Level/@comment-173.21.23.66-20170723053540/@comment-2A01:CB00:83C1:C00:A9F9:236A:2707:BD9-20170829225323

The Captain of the BS was not described as much stronger than the Pleiades as a whole but only stronger than Solution. He's most likely level 60 max.

I would say that the 13 Heroes (a lot more than that in fact) were level 30-35, 5th Tier magic can probably be learned at level 29.