u/Bigou_555

Hi everyone, I'm new to this subreddit and I'm planning to run the 5e's "Dungeon of the Mad Mage" adventure for my group.

Since I found Halaster to be such an interesting character, I'd really like to know more about him. Does anyone know of any other books or sources where I can find more information about who he was, and older campaign books in which he appears or is at least mentioned?

Thanks for your help!

***I put this in a spoiler because I don't want any future players to find out too much about the Mad Mage.