In 1996, TSR released the module named “Undermountain: The Lost Level” with the product code “TSR 9519.” It was the first adventure for the newly-conceived product line called The Dungeon Crawl Series. Written by Steven Schend, the module aimed to elaborate on the massive dungeons of Undermountain, while simultaneously revivifying the dungeon-crawl adventure genre. “The Lost Level” consisted of a 38 page dungeon-crawl with adventure hooks set in the lower depths of Undermountain. The adventure was imagined as a high-risk, high-reward story that aimed to keep pressure on the heroes with steep consequences for failure.
This conversion guide allows DMs to run the original module with 5th Edition rules and provides a reference sheet for encounters.
To use this conversion guide, you will need a copy of "Undermountain: The Lost Level".