Max: 1

You either study one of the 8 Arcane Lores of Magic — Beasts, Death, Fire, Heavens, Metal, Shadow, Light, or Life — or practice a lesser known Lore, such as Hedgecraft or Necromancy. You may now memorise spells from your chosen Lore for the following cost in XP.

So, if your Intelligence Bonus is 4, it will cost you 100 XP for the first spell, and the next 4, then 200 XP for the next 4, and so on. Full rules for learning new spells are provided in Chapter 8: Magic. Under normal circumstances, you may not learn more than one Arcane Magic (Lore) Talent. Further, you may not learn the Bless or Invoke Talents when you have the Arcane Magic Talent. You can unlearn this Talent for 100 XP, but will immediately lose all of your spells if you do so.

Core Book, Page 133