Last-minute training.
If you can't beat Luther in the final floor of the spiral tower, then there's a good way to train and level up. In the last floor of the spiral tower, there are only bio-chimeras.
They usually only give you 6666 exp when you beat them. However, what you should do is, when you fight one, use a Simbologist ( Fayt preferably), and stay far away, casting simbology spells.
Your people should be able to hit it enough times to get the bonus battle gauge full. Keep doing bonus battle chains until you get triple exp. With triple exp, the chimera gives you a grand total of 20,000 exp.
Keep doing this and you should level up in no time.
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