In her entire lifespan, Acrypha had met countless people from all kinds of races across all dimensions. Many of them had the skill to manipulate anyone as they wished with words alone and it worked perfectly each time.
In a world where power is the one that rules, these people used their only gift, words, to pave their own path and they excelled at it better than anyone else. So, to protect herself, Acrypha had to learn how to deal with this type of people.
Surprisingly, it turned out way better than she expected. Not only did she learn how to do that perfectly, but Acrypha also learned how to manipulate them herself. Her cleverness and cunningness were in no way inferior to them. In fact, in a sense, she was far better at it than most.
So, with time, that slowly turned her into a stoic and emotionless person. Rare are the people who could get a reaction out of her and even those can't really make her fully open herself.