I'm surprised so many of you like the art so much. I though cubism was a matter of the past. But seriously, it reminds me of "Der Blaue Reiter", or Franz Marc, to be specific. I don't really dislike it, but i don't understand why it's so super-amazing.
Also this translation is terrible. I have to assume the translators didn't know the art, but even then "Einladung" fits NONE of the meanings of summon ("Vorladung" or "Einbestellung", maybe). Adventures having a fantasy theme should have been a hint, too.