Well, here is basically how it works:
[sblock]If Camnor can convince the players into letting him perform the ritual, he will simply implant a seed in each PC's arm which gives him some power over them.
The seed does not give him complete control over the one affected, however. It simply allows Camnor to know where they are and gives him a +2 bonus on attack rolls against anyone affected.
A DC 30 Arcana Check lets a PC figure out what has happened, and a DC 25 Heal removes the seed and ends the effect. [/sblock]