"I, Dai Yimu, the head of Soul Fortress, take pledge/oath in the name of all 5 immortals that what we will be talking about in this meeting, I will not leak.
I will also assist Snow Palace Sect and others if they truly can assist Soul Fortress in capturing the whole Wicked Soul Society." Dai Yimu takes his oath and then he sits down.
He further said "I will believe in your words Sect Leader Chang Niu"
Seeing him, everyone else took their time to think, and eventually, they also started taking the oath
Soul Fortress is an independent organization and they chose soldiers from various Sects and even from towns if they think that the one they are picking is worthy.
They bear great responsibilities as they may not look after things like theft, scam, or even murders and only work on dangers that are on a grand scale level, but still, they try to make a proper justice system in each town by choosing few people from the sect that rules the town