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3d) NEVILLE AND THE GHOUL
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After the cut scene head down to the Muggle Studies classroom which is on the
5th floor. Welcome to another duel in this room, same as last time, keep 
casting Flipendo and Expeliamus to repel the spells. Once they have gone, go
to the end of the corridor and through the door.

Walk toward the door on the left, where you will be strangely be attacked by
some instruments, destroy them with flipendo. Continue through the door at the
end to reach Neville. Switch characters the Ron and search the box on the right,
you will be sent up to the top floor, where you will be attacked. Kill all of 
them, otherwise you will not be able to move onto the next section.

Keep on going through to doors until you get to the room with the Lumos Duo 
spell book, get the spell and 3 "invisible" things will appear. Use Lumos Duo
on the lantern weilding maniacs until they are visible, then quickly cast 
flipendo twice on them. After all six have been defeated target the crystal 
ball and cast Lumos Duo. Finally go up to the mirror so it is in line with the
light from the ball to open a new door, get the house points and exit the room.

Kill all enemies as you travel forward with the Flipendo spell. When you have
gone through the final door another boss will appear...

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Boss Number - 2
Looks Like - Robot
Defeated by - Flipendo

When his chest is visable target it and use Flipendo, if he manages to let off
a few rockets run quickly as they are homing and will take off a fair bit of
health from you.

*ALTERNATIVE*

Arnoud Van Bruven says:

"Stand in front of the Robot and he won't move from left to right any more, 
Cast Expelliarmus the moment he starts shooting his missles, this will take him
out quicker, although you will suffer hefty damage if you are too slow."
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When the boss is defeated cast Lumos Duo on the crystal ball. When you drop 
down target the ghoul and cast Lumos Duo on him, leading him into the newly
opened room. Go back to the Common Room (7th Floor) after the ghoul has been
trapped and end the day.