There is a huge map on the table provided by the spies under his brother
Belarion look at the map and nodded
The one who proposed this plan is Xiwanu. But the one who conceived the idea is Belarion. Belarion knows the objective that Aeryon gives him
Contain the Nergui tribe so that they could not aid the Ultar tribe and the Chagai tribe
The idea came to him simply because he knows that the only way for him to contain Nergui tribe is to make sure either he came to them, or they came to him
And it would be better to make them come to him. And for them to come to him, he either has to create a bait that they would try to take or try to take something they could not let go.
Belarion knows that he has no baits that he could use to entice the Nergui tribe to come to him and engage him
Since he could not produce a bait, then he needs to try to take something that they could not let him have.
Contain Nergui tribe
That is the task.
