When Goblins Die, No Comets are Seen (5E)

From publisher blurb: A 5th Edition Mini-Dungeon for 4-6 PCs of levels 3-4 After delving into the upper tunnels of a recently-abandoned mine pursuing mutated goblins, the party follows some buckled minecart rails, finding rough tunnels and unexpected chambers at their end. A palpable sense of fear pervades the area. The last members of a decimated tribe fled into these depths, but have no idea what to do now. They reached Area 5, but felt the sudden appearance of a worked room meant more trouble. Infamous amongst their kind, and fearing an unheralded death, they’re currently psyching themselves to fight back to the surface.