Trillion-Ghost Banner: Gain One Ghost Soldier Every Second

As the myriad races vie for supremacy, Fang Jian obtains the Banner of a Hundred Ghosts, which grants him one ghost soldier every second.

Inside the Banner of a Hundred Ghosts, all the ghosts fight among themselves, like insects bred in a poison jar, producing ghosts of ever-higher levels.

Ghost soldiers, little ghosts, old ghosts, green-faced ghosts, vengeful ghosts... ghost generals, ghost kings, ghost gods, and so on.

Your Ghost Soldier No. 1 devoured ten ghost soldiers and evolved into a little ghost.

Your Little Ghost No. 1 devoured ten little ghosts and evolved into an old ghost.

Your Old Ghost No. 1 devoured ten old ghosts and evolved into a green-faced ghost.

Your Banner of a Hundred Ghosts now contains a green-faced ghost and has evolved into the Banner of a Thousand Ghosts.

Your Green-Faced Ghost No. 1 devoured ten green-faced ghosts and evolved into a vengeful ghost.

Your Banner of a Thousand Ghosts now contains a vengeful ghost and has evolved into the Banner of Ten Thousand Ghosts.

Your Banner of Ten Thousand Ghosts now contains a ghost general and has evolved into the Banner of a Billion Ghosts.

Oh no, I've captured every ghost in the world.

Oh no, I've captured every ghost in the Ghost Realm too.

Oh no, I've turned every foreign race across the myriad worlds into ghosts and captured them all.

How can I evolve this into the Banner of a Trillion, Quadrillion, Quintillion, or even Sextillion Ghosts?

Urgent! Waiting for answers online. What do I do?

This novel and its characters are entirely fictional. Any similarities are purely coincidental. Do not imitate.