| Ravenclaw's Diadem was destroyed by Fiendfyre in the Room of Requirement. Crabbe set off the Fiendfyre while Harry, Ron, and Hermione were looking for the Diadem and destroyed it (completely by accident of course)! So I think you should change the 'Who destroyed it?' to 'Who/What destroyed it?' and accept Fiendfyre, as Vincent Crabbe didn't intentionally destroy the Diadem wheras the others were all destroyed with purpose. |