В процессе where can you learn the armsmaster and sniper skills/talents?

[corrupter]

As the title says.
I'm in chapter 6 and I see there's armsmaster skill/talent and sniper which are on 0% for me.
Where can I learn it and what does it give?

thanks a lot in advance.

 

[Хедин]

@corrupter, учат только на первых трех уровнях сложности, Вульфгар, Маркус, Ингольф, Драгомир. Дают доп. урон небольшой.

 

[corrupter]

Oh, that's why I couldn't get it haha, cool.
It's kinda misleading I gotta say.