Open the gate and now you will have to fight with two blast-ended skrewts. Jinx them from behind. After succesfull fight, go to the stairs and take your sixth mini-shield.
Go upstairs. You will get to this place.
Watch out for vampyr mosps. Cast Crape Retractum on the draw-bridge and then get to this place. Cast Herbivicus on the flower pads and go up.
Here jinx your fourth dragon statue. Open the gate and you will find your seventh mini-shield.
Continue your way, go downstairs and in this place you will notice your eighth mini-shield.
Jinx your fifth dragon statue and then jinx your fifth shovel.
Now enter the green house and go upstairs. Watch out for vampyr mosps and cast Herbivicus on the flower pads to unblock the way.
On the top you will find your ninth mini-shield.
Now you have to smash the fountain. Use cauldrons to destroy it. When you do that, the Triwizard Shield will drop down.
Watch out for erklings. Now go down and in this place put out the fire with Aqua Eructo (C). Near the Triwizard Shield you will find gillyweed.
To get the next Triwizard Shield, you have to go back to this place. Watch out for dugbogs. Use a bubotuber to destroy mushrooms and free your way to the next Triwizard Shield.