The control tool is made by Lord Rawal in Geneforge 5 and is put in his subjects. It is extremely hard to remove. It can only be removed by someone powerful in a faction. To remove it you must join said faction first. It is a small tool placed in your chest. It has a tendral to go inside your heart. Lord Rawal, if you are near him, could kill you with this. So it is best to remove it right away. Doing this decreases your endurance by 1. As a result, your health goes down.