Because [Labyrinths] were not [Dungeons], as the former originated in this very land and dimension, Mages managed to set up numerous teleportation circles in safe areas from the first to the fourth floor of the Labyrinth of First Sin.
That being said, from the first year to the fourth year, students gradually entered their designated labyrinth floor for the practical exam under the Dungeon and Labyrinth: Companion Raid, signifying the new beginning and the end of the semester.
Aside from every student and their respective butlers, the academy also entrusted several warriors and mages to oversee from afar the safety of these young adventurers.