The Red Dragon is completely immune to all of your attacks, and you absolutely cannot kill it the way you’d kill the other 99.9999999999% of monsters in Final Fantasy VI. This is one of the weirdest fights in the game. It doesn’t have much HP, so it doesn’t take a really long time to kill. Get Vanish onto at least one of your party members once the Earth Dragon is enraged to avoid its physical attacks, then continue chipping away ’til it croaks. Gaia Gear will absorb the hits, which is handy, while Angel Wings will allow your team to avoid damage without losing float status… which they will if you just use Float, since Earth Dragon loves 50 Gs coupled with two more earth-based attacks. Start by equipping items that will absorb or otherwise avoid earth attacks.

This latter move can be enough to kill your entire party in one round. Worse, once it takes enough damage Earth Dragon will become enraged and use multiple physical attacks at a time when its turn comes up. It spends the fight either using a variety of all-hitting earth-elemental attacks to strike everybody, the worst of which is by far Quake (which also heals the dastard), or smacking your characters with a physical attack that can hit for 6,000+ HP of damage. Earth Dragon is similar to its old form, though this one is much stronger.

Final fantasy vi advance strategy guide