Encounters - Volume IV: In the Ruins of The Underearth

From publisher blurb:

Ancient Ruins Hide Deadly Secrets.

Aranea waiting to ambush unwary travelers. Rapp’akh mage asking for help with his golem. Ghost warriors guarding the ancient bridge. Efreeti waiting in an ancient forge. The ruins of the Underearth are a dangerous place, hiding foes ready to bring the heroes down.

This encounter pack contains 10 carefully designed underground themed encounters for both the 5th edition and 3.5 edition of the world's most popular roleplaying games, with monster tactics, leads, hooks, and new monsters and items to spice up your game. Easy to use and drop into any adventure–to fill up blanks on the map, make a long journey more interesting or kickstart another adventure.