Alright, once you enter this place, head east and head up the stairs you see and on this floor, grab the Treasure Chest you see to get a Ripper Knife, which, if anyone is using a Knife/Dagger, give it to them. Then, head south and follow the path and go up the stairs here and on this floor, head south across the electric floor, which deals 1 damage of HP to you per step and grab the Treasure Chest here to get a Venom Axe. DEFINITELY Equip this if anyone uses Axes, as it's VERY good and after this, head back down to the first floor and once there, head west and head up the stairs here. On this floor, head up the stairs to the west and on the next floor, head west and go up the stairs and on this floor, head east and grab the Treasure Chest here to get a Diamond Helmet. Give this to Firion or anyone else that may need it and afterwards, then head west and grab the Treasure Chest here to get a Diamond Gloves.
Again, give these to Firion or whoever else that needs them, then head back down the stairs and on this floor again, head south and go up the stairs you come across. On this floor, head east and head up the stairs to the west, ignoring the ones to the east at the moment. On the next floor, head south as far as you can and grab the Treasure Chest to the east here to get a Defender Sword. Give this to Firion if he uses Swords or whoever else, maybe even Gareth if no one else uses them, but make sure to give Gareth the next best Sword if you Equip someone else. Next, head west and get the Treasure Chest here to obtain a Diamond Mail, which is guarded by Generals. These guys are DEADLY, so be careful and after this, give Firion the Diamond Armour or whoever needs it the most.
Afterwards, go back down the stairs here and on this floor, just head up the stairs to the east. On this floor, just follow the path and go up the stairs and on the next floor, head east and then north when you can to find a Treasure Chest, which holds a Zephyr's Flute and it's guarded by a Green Dragon. This is a pretty tough Battle, so be prepared. Using Bolt will definitely make the Green Dragon easier, so make sure you use it. After all this, head up the stairs nearby and on the next floor, head north to find Emperor. As you get near him, he'll send his Royal Guards at you, since he doesn't want to waste his time. You'll have to fight two Battles before he fights you himself and when he does, you'll enter a Boss Battle. If you want a strategy, head to Section VII. Boss Guide now, otherwise, fight this yourself and then move on.
After the Battle, Emperor dies, as Firion and the others head back to Fynn and tell Princess Hilda of what happened…