When you return to the town, you will see a lot of army. Talk with one of them near the town entrance and then you will enter the battle. Go to the cave that leads to Magmaroo, you will see the old lady has returned. Go to west house to obtain drunken dragon and then go to Stornway to drop your party. Go to Magmaroo-summit and then talk with Greygnarl (you must come alone!!) you will enter battle with Aggrosculpture ;equip all dragon equipment and talk with him once more. You will see an event and then you will end up in Gorfortress.
Just follow what the guard says until you meet with Sterling. Talk with everyone here (you can also save your game here by talking to the priest. There is also items shop near the priest). When you already finished talking with everyone try to pass through shield field. It will trigger an event, Talk with Sterling to return to Jail. On the night accept Sterling’s plan, Next morning go to workplace and then you will see an event. Make sure you equip all your previous equipment and then go to north tower by passing through shield field. Before you enter the tower back to Stornway to gather your party.
Climb up the tower and check red generator. You will enter the battle with lethal armor.
After defeating lethal armor check red generator and turn off the shield, get out from this tower and follow Sterling. Go check bookshelf on southwest to obtain recipe (walk like a tank). Return to B1 and enter the room. Talk with Goreham and
He can only attack once per turn but he can cause high damage with his attack. Make sure you have Priest or item to revive your characters. When one of your characters die, immediately revive them. I recommend that each of your characters have healing items.
(-) Chain swing: attack all party members, cause about 60 damages.
(-) Normal attack: 60-80 damage to single character (it seems this attack has high critical rate, it can do about 180 damages in critical. My MC died twice because of this attack).
Grab ultimate key from the chest and then go down to B1, free all celestrians and then talk with Sterling. Get out from Gorfortress and you will see an event.
You will arrive at observatory, go talk with Apus Major on L2. Go to Yggdrasil tree and board the train.