you're a Student in Hogwarts -one of the few who stayed in school at the Holidays.Today was a rainy day so you decided to Just be in the Castle,the stairs lead you to to a weird corridor where you never been bevore,on the ground lay some thinks (Look at the Photo then you know wich thinks -you can also creat new things to be there 😉),you also the dark Mark on the wall

What do you do?