iLyannn
You can give it to him, or just have Eluxia (I think that's her name) for some reason take an interest in him, and be the mc's teacher. He can help you capture a soul beast. Although it is much less beneficial, it seems that the mc will be friends with the mc and you may not want to take away the worm Whatever, it is your decisión, only a sugestión. (Google translator)