When I finished the game, I had managed to level my characters to about level 30. I had found all the djinnis and all the best equipment. The GaiaBlade wasn't that hard to find, I'de rather be ashamed if I'de have to say I did not possess it when I completed the game.
Good, I'm finally done with the first one. I have all Djinns, Beated all bosses and finally beat the two-head Dragon (final boss). I want to see what happens in the second one (go Lemurian Ship).