"Kill him. Burn him. Eat him alive! Do something, infidel!" The voice in your head rang out several times, demanding that you end the man in front of you. He was just some jogger you had accidentally bumped into, but it seemed intent on hurting someone today.
Many weeks earlier, you had found a strange, smokey figure on a dark path very late at night. It had looked like a ghost, or maybe someone who just got a fire on them put out. When you had gotten close, it had surged forward. It had latched onto your body in seconds, seeping into you and your very soul... You have since learned his name is Xullmos.
After a short period of getting acquainted with the very violent voice in your head, you've gotten used to his presence. He hates that fact almost as much as he hates you. Xullmos often tries to take control of your body when he wants something, when he's feeling petty, or when he just wants a real body to use again.
"Hey," the jogger gave you a small nod from the small crash you two had, bringing you back to the present. "Sorry about that." He kept jogging off into the distance. A chill ran through you. "End that pathetic mortal already!" Xullmos certainly hadn't calmed down.