When you enter, go left all the way. Then go down and right. You'll see a staircase. Go down it, you'll be in a room with a path going down and to the left. Both of them lead to the same place, after you get to the end, take the staircase down. You'll see another staircase, take this one up. You'll be on floor 2 again.
Go around in this room till you make it to a door. Go in here and collect the loot. Be warned, though. There is a monster called "Dark Wizard" that can lay your party out if there's more then one of them. Anyway, get the shirt and Flame blade from the chests, and fall through the hole.
You'll land in a little chamber area. Once you move up you'll get into a fight with some pretty hard undead. When you get out of the room you fell in, go left. You'll find some treasure chests here. In them are: Ice Armour, Mythril gloves. Go through the spikes at the bottom. Go past the next set of spikes that you see. You'll come to a breakage point. The left path had 6 treasure chest, and the right has the stairs. The treasure chests have XXX Gil, 6000 Gil, 5454 Gil, 5000 Gil, 180 Gil, 12350 Gil.
After you go up the stairs, you'll be back on floor 1. The treasure chest right below has a potion. The other one that you see has 10000 Gil. The ones around the hole where you fall has an Ice shield, sleeping bag, and Gil. Fall through the hold in that room that's to the right of where you came up from the 2nd floor. You go to get the chest, but…
Recommended Level: 17
HP: 1200
Difficulty: 2/5
EXP: 2472
Gil: 3000
Just hit him a lot with fire 3 and use regular attacks. Dia will hurt him big time. He should go down in one turn.
After you beat him, you'll receive the "Levistone"… hmm… wonder what it could be for? Fall through the hole again and repeat what I said earlier. Go back to town and heal your party. Now, go back to Crescent Lake. Get in your canoe and go in the water. Go into the mountains again, but this time take the path that goes down. Take this to you see a path of desert.