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3k) THE LAST DAY OF TERM
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Go down to Hagrids hut and then there will be a cutscene where you will be in 
the Whomping Willow, follow the tunnel and kill all the Red Caps, change 
characters to Hermione and enter the room with the 2 salamanders, kill them 
using glacius and flipendo, then use Harry to pull the bridge across using the
retractum spell, where you will be greeted by more salamanders, kill them. Head
to the next room and kill the doxies in there. Pick up the trunk and move it
near the switch, climb up and press the switch, and now there will be a 
cutscene.

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Boss Number - 4
Looks Like - Dementor
Killed By - Patronus

You will not be able to start killing the Dementors right away, first you will
have to drag Sirius up the lake, Harry will drop Sirius and then you will have
to start to attack the Dementors, attack the ones closest so they do not suck 
the soul of either you or Sirius, after a few hits there will be another 
cutscene, you will be on the other side of the Lake.

Power up patronus and shoor it through the centre of the dementors so that you
can clear a path to Sirius, once a patch has been cleared tap the A button to
make the Patronus charge and kill the dementors that are sucking Sirius soul,
hit 5 of these and enter the final stages.
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Hop on Buck Beak and fly to the tower where Sirius is being held, he will fly
away on Buck Beak into the night, you will then be in the great hall, talk to
Dumbledore to complete the game or you can continue to explore Hogwarts before
talking to Dumbledore.

Game Complete!!!