Impeccable timing.

The main difference between the adventurer association and the League of Assassins was that, unlike the Association where just anyone could join, the League of Assassins only invited extraordinarily talented and powerful individuals to its rank. Every single person partaking in the meeting were wanted and labelled as extremely dangerous.

Seeing that everyone in the League had joined the meeting, the masked man dressed in all black finally spoke. 

"I have a task for all of you." On saying this, the entire room instantly quietened down.

Usually, they were individually assigned missions because 1 person was enough to handle most missions, and not everyone could afford their fees.