Ok, I go to the very north and go through a cave. Then when I come out it puts me across the screen on the other side of a rock ridge. There's a bunch of glowing guys that tend to kill me, I head north a little and go in another cave, A number of floors down the cave I run into a huge door, when I walk at it a message pops up and says that it is locked tight and a key is needed. I got the funny brass key in the third level of the Learning Tree. Is their some certain way you need to use it or am I missing something? I'm hoping it's not some evil glitch I'm having.
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Experience is the hardest teacher, she gives the test first and the lesson after.