The interesting thing to me is that according to Plato, there are 3 worlds. The four kings, the vortex of souls and Idea are in the third world. Now, we haven't really seen the third world merge into Berserk yet, but if Miura's following Plato's logic (which seems to be the case) things might...
Good point, but considering that 1,000 years ago, Gaiseric's empire (aka Midland) was really the be all end all, we can assume that Idea probably also considers Midland to be the most important nation.
Well, you have to consider that most of man's desires are evil. Mankind does have some good desires, and to reflect those, Idea also has some good desires. For instance, Griffith returning to save Midland, who do you think set that up? ;)
Re:Gut's Desires For Sacrifice
If Guts had to make a sacrifice, it would be the most important thing to him. Aside from Caska, if she indeed can't be resacrificed, or if she isn't the most important thing to him, I'd say it would be revenge against Griffith. So, Guts would have to give up...