I see a lot of disapproval from people for this ark, but I feel like this is a "breather" from the main story, be it for planning the plot or to rest or something. Either way this ark is good enough to be a fantasy manga in itself... my point is, I am enjoying the ride, don't think it deserves...
I think the king is a beatboxer and when he names the heroes he gets too excited by himself and start beatboxing out of control. The heroes get stuck with the result as name LOL