The forgotten city is defended by the emperor's 5 Generals. The first enemy you will meet is Mobile Nacks, who will decrease every teammate's HP by 5000 at the very beginning. Consequently, make sure every teammate's HP is more than 5000 before you join in the mission. After you kill Nacks, go back to Scout Morris to get Lucky Core Pack or Meteor as reward.

After you will meet Fallen Clian, who can also decrease your HP by 5000. Meanwhile, 6 Cruel Killers will come out to help him. After you defeat Clian, talk to him to get your prizes.

Beast Finnes is a tough guy to solve. The first thing you should do is to destroy Beast Organ. After you take him down, talk to Scout Caris at the gate to get Lucky Core Pack or Meteor.

Spider Grandal is a cunning guy. When you talk to the Captured Solder, he will swoop you! After you kill him, there will be a lot of smaller spiders coming out of his body. Sweep them and talk to the Captured Soldier to get your rewards.

In the fifth zone, you will meet Marshal Adonis. You have to kill them 3 to complete the mission here: Marshal Adonis, Marshal Son and Marshal Wife.

The Emperor Feddrian can't wait killing you. Beware that there are lot of traps on the ground. Both your enemies and you may get killed by these traps.

Make use of the traps when fighting against Emperor Feddrian in the first round.

In the second round, the traps are also very effective. But 5 Emperor Shadows will come to help him.

Once you kill all the 5 Emperor Shadows, the battle with the Emperor Feddrian will go into the final round. Kill him to get his Star Badge!