Diamond bow
Kink looked indifferently at his students who were standing in front of him in order on a meadow with nothing but grass. It had taken them five minutes to do so, much to his annoyance, but they had already told him that he couldn't be too harsh, so he didn't scold them.
"... Fine, as I told you, you will enter a C-rank dungeon." Kink smiled a little when he saw the fear on his students' faces. "But don't worry, I know very well that a C-rank dungeon is too much for brats like you."
"So I asked the director for dungeons modified by him where you will be expelled if you receive a mortal wound."
Everyone sighed in relief. They knew that no matter what they did, only death would await them in a C-rank dungeon.
"Although I wouldn't feel very relieved if I were you." Kink sighed in disappointment at the weakness of most of the students. "Since you can't die, you'll have to try to clear the dungeon as quickly as you can."