In 1980, TSR published A1: Slave Pits of the Undercity. It was written by David "Zeb" Cook and illustrated by Jeff Dee, Dave LaForce, Jim Roslof, and Bill Willingham. The 22-page booklet had an outer folder containing maps.
This adventure was originally designed as a tournament module, rewarding players for what they accomplished in addition to how long they survived. It became part of A - Aerie of the Slave Lords and is ranked #20 in Dragon The 30 Greatest D&D Adventures of All Time.
This conversion guide allows DMs to run the original module with 5th Edition rules and provides a reference sheet for encounters, magic items, traps and creatures.
Note the original module is required for the use of this conversion product.