At first, Yvette was able to deal with them all easily, but there were just too many of them. After repelling a wave of royal soldiers, more soldiers behind her replaced their fallen comrades again. The Power of the Fiend Soul in her body had gone down by a lot and she began to struggle.
Although she possessed a fiend soul, she had not fully comprehended the power within it, nor did she know how to use it flexibly. It was safe to say that she had been utilizing it in a not very optimal manner.