PS. MC didn't know that magic could be used as poison. The system didn't prompt any presence of poison in the soup, so MC had no reason to deny it. It's hella cold beyond the wall.
You guys don't understand that as the author, I know the plot. This ending was decided right from the very beginning. MC was too arrogant, and that led to his demise. If this was the MC from chapter 10, he'd have killed Brynden and the green shits before asking questions.
If you're unable to comprehend, that's on you and your limited imagination. Here I thought you guys would be smarter after that Healing skill fiasco.