How To Run Halaster The Mad Mage

As part of my continuing series on lessons from the Mad Mage megadundeon, I talk about how to have Halaster interact with your players. The text tells us that Halaster wanders the halls of his dungeons and is constantly changing its setup, gates and monsters. So it makes sense that the players would have interactions with Halaster long before they are powerful enough to take him on.
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