C72 Little Senior Sister's Invitation.

Chu Feng picked up the Demon Soul Grass with his fingers, and the system quickly responded.

[One Demon Soul Grass can be exchanged for a wisp of Demon King's soul. After the exchange, it will increase the strength of your soul or mind. It can be stacked at least 100 times. This will have a strong effect on Alchemist, Formation Master, and Psychic Masters, do you want to exchange? ]

"Exchange