Dalek Attack on Hogwatrs

Finding Hogwarts in ruins, the Doctor at first assumed they arrived immediately after the battle the resulted in the death of Voldemort, but after checking the date in the TARDIS, he realized this was many years later. 
The Doctor returned to the TARDIS and went back in time just a little bit further, and when he opened the door, he found out what had caused the destruction...

About a week ago, I created a new model of a Dalek Saucer. Couldn't decide how to introduce it until now.