After Ka Dingil surfaces, go to the Elw Pyramid north of Milama and transport back and forth. You'll need a lot of patience. Eventually you will end up in the Abyss.
At the end there is a boss that has done over 6,000 damage to each of my party members simultaniously. This killed them all right away an they were all over level 65.
Just a warning to all who venture to the Abyss (It's optional, anyway), fight at the Ancient Arena several times to raise your stats.
A good way to do this is to duplicate a couple Lucky Cards and use them at the start of each fight.
You should also go to the 3 islands in the south and fight the Toyokonton's, which appear in pairs of 2 with 28,000hp each. I definitely advise using the lucky cards when fighting them.
When you do, you gain about 80,000 experience and 60,000 Gella. I level up after every fight with them.
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