Each member of the army must defeat a Dementor.
The first one should be defeated with theExpecto Patronumspell.
Select a character that can summon an animal.
Get inside and walk through the whole maze.
The green key will fall out.
Use it to launch the locked cabinet.
Another Dementor will appear - use theEPspell to get rid of it.
Approach the vines and useLMspell to bend them off, then activate the chain mechanism.
Another Dementor will appear.
Defeat it like the previous ones.
Shoot at two shields in the corner of the room and in return you will get some bricks.
Another Dementor will jump out - destroy it by using theEPspell.
Switch toHermioneand approach the bookcase on the left.
Solve the puzzle and obtain some bricks as a reward.
Build a tool for setting a fire, jump on it and pump the last Dementor.
Defeat him by using theEPspell.
After these events you will permanently unlock theEPspell.
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