Gustav had been coming here for close to three months to train himself and get through the levels of the dungeon.
The lower you descended, the more powerful the mixedbreed.
Gustav's limit currently was level sixteen, and it was even quite tough for him to get to his current stage. He couldn't defeat the creatures in level sixteen using normal means, which was why when he wanted to kill the Dark Venom worm, he had to get into it so he could attack from within.
Even with that, he had to make use of God Eyes to spot the weaker section of the creature's mouth area so he could end it before he ran out of time.
Normally, the senior cadets formed four teams before heading in if they were going without any supervision from instructors, but Gustav had been coming here himself since day one.
The officers guarding the dungeon entrance advised against it on his first day here since they couldn't do anything to restrict him due to his title.