You see a heart-shaped object floating before you, pulsating a vibrant magenta light. A Voice speaks to you within your mind... I am the Dark Heart. I will allow you to alter the reality of a fictional universe of your choosing, in whatever way you command. You will then be free to explore the altered world to your leisure. ...But do not lose me. For If I fall into the hands of another... that reality becomes Theirs to command. Which world do you desire to alter?