The Factory is the third quest from Montero.
Before: [name], I believe you are powerful enough to venture further into Darkness. Darkness is building an army, and you can stop it. There is a being in charge of the whole rocs, the Fire Lord. Take one of the Empire's boats to get there, and slay it.
During: There are 10 floors. You should take some other soldiers with you to help you.
Defeat the Fire Lord, found on floor 10 of the War Factory.