Why?

Yaana's expression turned an icy shade of cold. It was the kind of expression she had gotten far too used to making ever since she had stepped into this so-called martial world. And, the words of Zech only infuriated her all the more. Even among Necromancers, the individuals who wouldn't let even a corpse go were among the most disgusting and vile experts they had to offer. 

Yaana instantly found herself going from being assaulted by a dozen individuals to the amount doubling then tripling in an instant. Corpse puppets of all shapes and sizes charged toward her from all sides. Some were armored beasts, others were pale-faced humanoids, and the last were entirely made of bone, brandishing the very same bone spears that had almost impaled her a moment ago.