The master of stones

"I think not you little puppet!" Kasuqul and Jon looked to the source of the voice that they just heard. The voice was dark and full of evil. With every word it felt as though their very souls were being peirced. "That stone belongs to me.
Jon could see a figure standing in his room, he seemed to be a living shadow exept that he had two dark yellow eyes. Around him floated six other stones that looked like Jon's wishing stone, exept they were all diferent colors.
"Who are you?" Kasuqul asked the person standing in the room, "And what do you mean by 'puppet'"
"Don't play dumb with me you little fool! I own you and your soule! You signed a contract for that stone, but you were tricked by this kids grandfather! Now I am here to collect your life force for myself and take back my stone to complete my collection once more."
As soon as he said those words he stretched out his hand and took hold of a clear stone and pointed it at Kasuqul. She began to shreak with pain as her body began to wither away untill she was a pile of dust on the ground. The wishing stone floated over to the person and joined the other stones.
"Preaty cool huh? This little wishing stone cannot take someones life to that extent. These other stones fill the gaps of this thing! Wish reversal, dimension hopping, life taking, mind controlling, shape changeing, and immortality. These are the gifts that I receive from these other stones. I bet that you are thinking, "Oh, I could just wish for them" right? Well you could, but it would eventually run out. Now I give you a choice little boy, I will lend you one of my stones because I am feeling generouse today. I am not giving you one, I AM LENDING it to you. I will be back one day to retreive it, and I will know everything that you do with any of them. If you try to keep any one of these stones for your self, you will be a pile of ash. Now chooose one before I change my mind. You have one minute!"