The guide advised that they prepare a single structure that would be able to house all of their manpower and war machines and would be able to slip into the world of Aries before the spatial channel could be closed.
This way, by the time their presence in the world of Aries was noticed, it would be too late to stop them. This is better by scattering their forces in many vessels, which creates many opportunities for their forces to be blocked from gaining entry into the world.
There was a risk that by putting all of their eggs in one basket, it would be easy to destroy them in one fell swoop, even if they managed to enter Aries. This is why the guide advised them to prepare a very sturdy structure for invasion.
Fortunately, the Red and Blue Fire sect had a solution to this problem. They had something called a mothership.
