Well, I'll have to test it for you unless someone knows, but here's what I do know:
- 0 earth strength spell gives 3 strength
- 40% base petri resist + 4% per earth skill trained
At the very least, you can untrain 3 strength and just cast strength to maintain 5 strength. You could also untrain 5 strength and train it into earth, which would make you petrify immune (60%) and probably make your strength spell give 4-6 strength. I'm not sure how much earth is needed to boost strength.
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