For a long time I stopped playing AD&D (2nd edition), and my books were left to sit on a shelf. Recently, I have started to play again with friends and family, and we are going start a new campaign with new characters.
I wanted to use more than just the basic races and wanted to use an illithid (more specifically an alhoon) but I can't remember which rule book gives the information to play monsters and the like.
All I need is the name of the rule book, but if you are willing to share the exact ruling of how to use this race of character, I wouldn't mind.