With unbelievable luck.
Harry was seeking the Horcruxes to destroy them. He already had one of the Hallows, that being the Cloak of Invisibility. The other Hallow was the Philosopher's Stone and the third was the Elder Wand.
They need to find (and destroy) the Horcruxes.
Ronald Billius Weasly. Hermione Jean Granger.
find out horcruxes and kill voldermort
He runs because he need to go find and destroy all the Horcruxes.
It means you have been thinking about Harry Potter, either consciously or unconsciously.
Harry lives, Voldemort dies.
If you have seen the 6th one you will understand that Harry Hermione and Ron leave Hogwarts to find and destroy the horcruxes. Do not read the following if you have not read Harry Potter 7. Harry kills Voldemort with his own Avada Kedavra as well as expelliamus.
Harry and his friends (Ron and Hermione) set out to find the horcruxes. Snape is headmaster and Dumbledore is gone. The horcruxes have to be destroyed. But the horcruxes only take in what makes them stronger (like the sword of Godric Grindiffer). The horcroxes contain parts of Voldermets soul. There are two parts to the movie.
Harry, Ron, and Hermione need to find the 6 (of what they know) Horcruxes and destroy them. they found and destroyed them all to defeat Voldemort.
They were having a good deal of difficulty figuring out how to destroy the Horcruxes and the also struggled to find out where the Horcruxes were as they only one they found easily was the locket (and even that wasn't easy to get).
The main conflict is Harry needs to find all the Horcruxes to be able to defeat Voldemort and he solves it by skipping school and going to look for them.