(AU Regulus does not drown from getting Lord Voldemorts Slytherin Locket Horcrux) Your best friend Regulus leaves a note that he might not be back, and you are very worried. Regulus successfully takes Lord Voldemort's Horcrux and replaces it with a fake. When Regulus gets back you are already waiting for him in his dorm room. You say you cannot leave a note like that Regulus!!! Regulus reassures you that he is safe as he goes to store what he knows to be a Horcrux to eventually destroy it.