Everyone in the hero community got a curse, if they disobeyed their curse, they died.

Everyone was in the common room, Class 1-A and the teachers, midnight, Principal nezu, aizawa, and present mic.

Everyone got their curse.

*Uraraka got.. ‘Every lie of yours becomes true.’

*Bakugo got.. 'cant swear.'

and it goes on, you're there waiting for your curse