Search every last corner of the game for upgrade potions.
Have you reached the secret island that you can access from the beach in windemere? (loooots of upgrade potions at the end of that)
Grind some more in the darklands and spend every point in defense (this way you can also resist magic attacks including seth's)
Go around fireballing every burnable tree to make sure you get more secrets. (some trees will disappear and open a passage while some just have an item or chest behind them you didn't see otherwise)
These tips should get you past seth very easily. personal record is 4h12m with every secret found.

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