User blog comment:Godisme/KriegsErklärung/@comment-4026406-20120301022736

While this might not necessarily be anywhere near the answer to the question of what Vandenreich translates to, here's some possible speculation as to why Kubo would use a word that isn't in the German language.

http://en.wikipedia.org/wiki/Arthur_Moeller_van_den_Bruck

He's the guy who influenced the Third Reich and Nazism. And his name has vanden in it. Even if that's NOWHERE near the truth, especially because of this being derived from Kanji, I thought it was a nice possibility.