In addition to the Ghost Register, a ghost servant's cultivation also requires Swirl Beads.
For a ghost servant, the function of a Swirl Bead is just like the magical pills and elixirs for humans, capable of rapidly enhancing power.
This kind of Swirl Bead is formed by purifying the evil energy through a special method, which is recorded in the "Controlling Ghosts Heaven Scripture".
And evil energy is easy to obtain, whether by killing evil ghosts or zombies, one can obtain it, just in varying amounts.
The higher the realm of the evil ghost or zombie, the more and stronger the evil energy obtained, the better the quality of the Swirl Beads condensed from it.
