Dread Shrine of the Supreme Warlord (5E)

From publisher blurb:

Centuries ago, the hobgoblin warlord Morg Drolak conquered much of the surrounding lands. However, even Morg Drolak could not conquer the Final Enemy—Death—and now his mortal remains moulder in a hidden tomb. But unlife yet lurks in Morg Drolak’s shroud-wrapped corpse, and his tomb cannot stay hidden forever…

Dread Shrine of the Supreme Warlord is an adventure for 1st-2nd level characters set in the Duchy of Ashlar. It is designed to lie under the Shunned Valley of the Three Tombs (near the town of Dulwich) but is easily placed in almost any campaign setting.