The errata'd virtue Elemental Magic states:
You have been trained in the ability to manipulate raw elemental Forms (Aquam, Auram, Ignem, and Terram), and view them as a connected whole rather than four separate Arts. Whenever you gain experience from a source dedicated to one of these Arts, you gain half the Source Quality in experience points in each of the other three Arts. For example, if you studied Ignem from a book with a Source Quality of 13, you would gain 7 experience points in each of Aquam, Auram, and Terram. (This would not change if, for example, you also had Book Learner or Affinity with Ignem.)
In addition, if a spell with one of these Forms as its primary Form has another element as a requisite, you use the primary Form to calculate totals, even if the requisite is lower.
How does that impact xp allocation during character creation? The new description doesn't really say. So should one allocate xp to the elemental Forms, then add 50% of what was initially spent on a Form to each of the others?
For example, let's say the player allocates 88 xp to the elemental Forms (50 xp in Terram, 28 xp in Ignem, 10 xp in Auram and 0 in Aquam). Would this result in the following scores?
- Aquam 0 xp (initial) + 5 (Auram) + 25 (Ignem) + 14 (Terram) = 44 total xp
- Auram 10 xp (initial) + 0 (Aquam) + 25 (Ignem) + 14 (Terram) = 49 total xp
- Ignem 50 xp (initial) + 0 (Aquam) + 5 (Auram) + 14 (Terram) = 69 total xp
- Terram 28 xp (initial) + 0 (Aquam) + 5 (Auram) + 25 (Ignem) = 58 total xp
If the same character also has an Affinity with Ignem, then his total xp in that Art would be increase by 25, since the xp granted by Elemental Magic does not benefit from Affinity. So total xp in Ignem would be 94.
Note that the mention of Book Learner seems only there to make sure its benefits is not applied twice. After all, Book Learner states that "When studying from books, treat them as if they were three Quality levels higher than they actually are." This means that a magus with Elemental Magic and Book Learner studying from a Q13 book in Terram would gain 16 xp in Terram and 8 xp in each of the other elemental Forms.
Am I understanding the errata correctly?