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Thus, at the expert level, anti-magic removes ALL magical effects and grants immunity to them, while at the advanced level, it only affects spells of levels 1-4. Only the dispel charm ability has a success rate that depends on the level difference. There is not much point in leveling up the Squirrel, as it doesn't have any difficult battles, and you don't even have to fight against it.
I had a fully upgraded Godric, effectively level 34 with all the associated benefits and a complete set of light and dark spells. In general, the light + dark combination is overpowered and cannot be countered in long games against the AI. So, I simply defeated him in the first week with a Phoenix.