A magus experiments on a new spell he is inventing (a spell to change into a wolf). Following the example in the book, the experimentation yields a major side benefit, allowing him to also speak with wolves while in wolf form.
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Can experimentation change the final level / arts of the spell (e.g. in this case, one would expect an extra Intellego requisite and a boost in level)?
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When a second magus uses the lab text of the first to re-invent the spell (without experimentation), does he get the major side benefit obtained by the first magus?
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If so, what if the second magus himself experiments (on the lab text of the first), and gets, say, a minor side benefit as a result? Do the two benefits stack or does the second supercede the first?