For those of you complaining about Knossos being defeated so easily, Barca ( the shady shutin) explains it like this in the actual light novel.
The Daedalus of old had upheld a certain aesthetic.
An art in the chaos that made up the maze. By embedding a single light of order into the midst of its lawlessnesss, one could reveal it for its inner beauty.
Which is why, much like a certain other dungeon, Knossos had hidden within it a main route. A "ariadne guide," to put it another way. And no matter how many of the orichalcum doors Barca shut, that main route would still exist, effusing that girl's wind and leading her companions to her.
