"Since the day we were born, someone had to nourish Fenrir's fang. Sister never knew better and I shall not let her feel guilty about this. You shall die here!" Skoll growled as stone spears flew toward Cain at an immense speed.
Cain dodged immediately. He never expected his conciseness to be pulled here. This was bad for Skoll. If she touched him, she will be able to feel his mad soul.
The last one to see his soul was the lich. Even he wasn't able to handle it. Skoll will just see something that she is better not seeing. Just as he had touched something mustn't be touched, the shard inside them. She will get pulled down to his soul instead if she touched him.
"Stop! If you touched me this whole world will crumble." Cain yelled at her. It wasn't like his soul had any magical properties. It was that this world was made of Skoll's consciousness. It will get torn apart if her mind touched the madness in Cain.