How to get Zhenhaizhu in Fantasy Westward Journey?

Zhenhaizhu is LG’s sect magic weapon. Players above level 110 may receive this task during sect missions or ghost-catching darts. The effect is to ignore the spiritual power of opponent 1. Full I'll probably ignore about 8 layers. I haven't counted the experience of a full layer. It's quite scary. If I build 12 layers, it's about 3000W experience.