Death of the boss
Eon and Rein. The two of them were in a disguise. It should generally mean the two of them were trying to hide their powers.
It was normal that they would want to conceal their powers if they wanted to lay low and have a quiet, fun time at the academy.
They were also hoping to hide as many powers as they can while being in the student council and their goal was to finish this entrance exam while showing only fifty percent or less of their powers.
It was a good and surely plausible plan until the moment they made that bet to get more points and later come to this place while lusting after the core that made this whole place.
Eon knew if he took away the core of the island, the magic would disappear and the children might get hurt.
It would be difficult but he wanted that core and for that, he would have to defeat the guardian.
And Rein was getting bored so she just wanted to have fun.