How does multiple casting work?
On p. 87 of ArM5 are the rules for multiple casting, one of the special abilities a magus may choose for a spell he has mastered. The wording of the rules is a little unclear about exactly how many versions of the spell a magus may cast. Consider the following to be errata: Multiple Casting (p. 87): Replace the the last sentence of the first paragraph with “You may cast a number of additional copies of the spell equal to or less than your Mastery Score.” –David Chart, Berkeley Ars Magica List, 17 Oct. 2005 So if your mastery score is 2 and you have the Multiple Casting special ability, you could cast up to 3 instances of the spell simultaneously: the original plus two additional copies. The reason this is a Frequently-Asked Question is that the above errata were not corrected until several months after ArM5 was published.
