The Legend of Dragoon/Limestone Cave

Evil Spider
This is an earth user with quite a lot of HP, 30. He does average damage and has average defense.

Orc
An annoying earth user with 30 HP that can heal himself. Take his out as quick as possible.

Slime
Seems like a weak earth user with just 20 HP, but beware of its special attack, he can cause Arm Block, which will prohibit you from using one of your actions such as attack defense and so on... Obviously kill him as quick as possible.

Screaming Bat
The weakest of the bunch. It's an Dark user with just 12 HP. He should be no problem.

Ugly Balloon
Probably the most difficult enemy. It's a wind user that has 35 HP! Above that he has a high defense, and even worse, he can cause Poison, which will drop the HP of a character every time it's his of her turn. Poison doesn't go away when the battle ends either, when the next battle starts the infected character still has Poison. Cure it with a Body Purifier as quick as possible. You do have a change to ignore the status effect, Guard. If he tries to inflict Poison on someone that's guarding the effect will be ignored.

Limestone Cave
Just as you enter open the chest to your left for a Detonate Rock. Walk South but don't go on the small bridge yet, instead go South until you see an exclamation mark. Then press psx: X to jump down and open the chest. Go back and go over the bridge and proceed to the next screen. Here you'll have a small downwards river thing in which you can slide. Go in it and don't do anything. You'll get a chest containing 20G. Now get up, go back and do this same thing. But this time, tap psx: X through the ride to take a different direction. Here you'll get a Bastard Sword, which is a weapon for Dart, equip it if you don't have anything stronger.

Now head southwards and go off the screen. Here you must go across some stepping stones. Don't forget to pick up the two chests! Once you pass the chests you can't go back since your teammates will be behind you. The right chest contains a Total Vanishing and the left one contains a Body Purifier, which you'll probably need very soon (hint).

Go to the next screen. Go to the upper-right screen to open a chest. We'll get to that weird bouncing thing below you later. Then go back and go south and take the first turn right. go near the green things and press psx: X when the exclamation mark appears. Now you'll be able to heal here, just like the shack from The Prairie. Go right for an Angel Prayer and climb up for a BurnOut. Then go back past the healing spot and exit the South-East screen.

Catching the monster
Go North to go back at the weird bouncing monster. Don't worry it won't do any harm, you'll need to catch it if you want a pretty useful item. Open the chest to the left for a Spark Net. The area is basically a circle with a shortcut. Follow the monster. You'll notice that he always takes the long way, you're going to take the shortcut until you catch him. When you catch him he'll jump to the right part of the screen. Go there and he'll bounce his way off the screen leaving behind a chest containing a Poison Guard. The Poison Guard will make the character who equipped it immune to the status effect Poison. Equip it on whoever you want and go back to the previous screen.

Nearing the Boss
Open the chest for a Charm Potion and go over the pillars to the next screen. This short screen has nothing on it whatsoever so just proceed. Save at the save point and open the chest to the left containing a Body Purifier and the chest to the right containing a Bandana. If you enter the next screen you'll have to fight against a boss. Be sure to be on full HP and make sure that nobody is poisoned. When you're ready, enter the next screen.

Boss fight: Urobolus
This boss shouldn't be that big of a problem. The giant snake-like creature uses earth attacks and has around 275 HP. He has an attack were he spits some green jelly at one of your character which does some damage and has a change of poisoning. Besides that he can bite which does around 22 damage and he can attack you with some green smoke which causes damage to the entire party. Shana should either attack it with attack items, heal Dart or Lavitz or defend, don't bother using her bow. Dart and Lavitz should attack it with their additions. Don't forget to use a Body Purifier as soon as someone is poisoned!

In the midst of battle he'll climb through a hole and come back out of a higher placed on showing only his head. Dart and Lavitz' additions won't do anything since the monster is too high. Shana's bow can hit it but rather use attack items. Have Shana and Dart use attack items and make Lavitz guard if he lost some HP, if he has full HP make him use attack items too. Eventually he'll come back down and repeat the process until you beat him.