As I recall, you could cross-class skills in 1.0 as well, but in a very different manner. It could just be they're using skills from other classes, or even skills they created themselves. I remember that one of the Heavens' Ward is able to combine thaumaturgy with weapon play to imbue lightning into his weapon in one of the in-game references. I can't recall which but I know it's there. so it's entirely possible that people like Raubahn with a lot of combat experience have created their own fighting techniques.
As for Y'shtola, who can say. Again it could be that she's experienced enough that she knows ways to cast her spells that others don't because she's studied so long. In just about any environment with spells, there's metamagic, differences in casting method, and the like. Every wizard (or conjurer in this case) will likely find a way to customize and make their spells unique in order to keep ahead of the game. Especially with Sharlayans who study all kinds of old knowledge and magic theory.
As for Y'shtola, who can say. Again it could be that she's experienced enough that she knows ways to cast her spells that others don't because she's studied so long. In just about any environment with spells, there's metamagic, differences in casting method, and the like. Every wizard (or conjurer in this case) will likely find a way to customize and make their spells unique in order to keep ahead of the game. Especially with Sharlayans who study all kinds of old knowledge and magic theory.
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