Ley
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Really? ;) Have you tried it yourself? You can keep the initial spellcasting skill at its starting level for as long as you want – up to level 20 or so... There's no need to worry about it...
Well, actually, there's another way to keep this skill at its initial level...:), besides just advancing everything else except for it...;).
"Единственное, что можно сказать с уверенностью об удаче - она изменит..."