In my fantasy story, a new group of people come to this empire seemingly peacefully. But soon, they begin to blame these magical people for an assassination of the empire's empress, giving the crown to whoever captures and delivers the most people into the palace.
This sends the protagonist, who is a magic user, into hiding, and soon develops a team of other magical refugees. However, one day a person comes to them who is from these newcomers.
It turns out that she achieved the magical abilities randomly and was nearly captured by her own people, but escaped. But in truth, these people have to find a weapon hidden beneath the ground in order to kill a god that has destroyed their empire, and they are using the magical people as fuel. The visitor-magic wielder does not know any of this and only knows that there has been a disaster in her home and that they have come here for safety. Somehow they need to figure it out on the way.
What I don't know is how to reveal this big twist.
I know this is broad so leave questions below. And sorry in advance if this is really bad as this is my first question here.