The eastern bridge is a dead end. You will find a massive amount of gil in the chest west past the central area. Before you fight Rubicant, you will have to fight the King and Queen of Eblan. This is a Plot Battle and it really makes no difference what you do. Eventually it will end, and Rubicant will heal you to full before you fight him anyway.
Rubicant, on the other hand, is a tough boss. Using Ice magic is risky, since when he closes his cloak he absorbs all Elements. Therefore, stick to Bio or Titan for Rydia's offense. Rosa should put up Shell to help protect against Rubicant's powerful magic if she gets a chance between healing sessions. Edge can Throw Shuriken if you're willing to use them, but the major offense comes from Kain Jumping with the Ice Spear. Even with Rubicant's cloak closed, this will deal massive damage.
After the fight, you find the crystals! Oh no wait, it's a trap. You'll find yourself near where you fought Dr.Lugae, but on the other side of the floor. This is floor 8F B.
Rubicant, on the other hand, is a tough boss. Using Ice magic is risky, since when he closes his cloak he absorbs all Elements. Therefore, stick to Bio or Titan for Rydia's offense. Rosa should put up Shell to help protect against Rubicant's powerful magic if she gets a chance between healing sessions. Edge can Throw Shuriken if you're willing to use them, but the major offense comes from Kain Jumping with the Ice Spear. Even with Rubicant's cloak closed, this will deal massive damage.
After the fight, you find the crystals! Oh no wait, it's a trap. You'll find yourself near where you fought Dr.Lugae, but on the other side of the floor. This is floor 8F B.