I don't understand why you would refuse it at all, maybe you're just not very bright. You have 6 lightning magic stats, which equals 4 attack points. Do you want to take the third branch?
Voltage is required for the cloud spell; if you refuse it, the cloud spell will also be removed.
Update: Oh, I see, the new magic is the branch. So, if you want to keep the cloud spell, you should skip Electrification.
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