They Came From Below

From publisher blurb:

The misshapen thing erupted from sewer and stalked through the crowded streets. Any that dared impede the creature fell before its deadly fangs. A brave warrior approached and pushed the thing back, but as victory seemed certain, webs sprayed from the spider-like creature and the warrior fell, unmoving. The thing hovered over the motionless man and in one horrific motion pulled him into its bloated belly sack. The creature retreated back into the sewers but panic has gripped the neighborhood.

It Crawled From Below is an adventure for four to eight third level characters using the Fifth Edition game.