Ok, that is the Spellhold Maze.
SPOILER!!!
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You have the red crystal and you will also need the hand from a lich that you kill while in the same general area. You will need those items to open the door behind the Giant head. That will give you an exit.
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Defender for the Light -
Goodness knows there is a lot of Dark out there!! - Where are my matches?
Wandering Joke of the Laughing Hyenas