Goodman Games D&D 5E: Adventure: Terror form the UnderDeep

A giant box of adventure, spanning 10 chapters. It includes 4 books, nine adventures, a GM guide, and poster maps. Why have several giant clans in the Northlands, typically uncooperative war-like tribes, allied in a desperate attempt to collect electrum. After clashing with numerous giants, the trail of the electrum leads to the lightless caverns of the UnderDeep. What sinister power created such a wicked alliance and craves to return to the surface to wrack its revenge.