From the introduction: An airship has arrived in Northport with a certain aarakocra alchemist aboard, Hirak Rokwaw, looking to hire adventurers to procure some reagents for him. Specifically, he wants a certain type of mushroom that grows only in the tombs of the Ancient Barrows, a necropolis carved into a mountainside not too far distant. The mission is perilous, as undead will no doubt be stirred up by this invasion of the living.