a witch cursed a chest it was then given to your ancestors then it went on for thrust of years until it got to today everyone died in your family expect you the chest was passed on to you to make sure whatever curse the witch put on the chest is always calm and while your washing your face you see a shadow figure looking at you in the mirror then it disappeared after you blinked you then realised you forgot to play with the curse in the box You go into your room to go play with the curse as you open the chest to grab the curse and you find a folded piece of paper inside the chest a note that's probably from your ancestors, it said;

Dear descendant,

If you're reading this we must be dead, but to get to the point we have something quite important to reveal to you, this object inside of the curse is possessed by an entity that has been here since the creation of humanity. (also you’d only 15 with a legal guardian shes a girl and knows about the box)