Part 3: The Spider's Web

In this expansive chapter, the adventurers venture into the wild regions surrounding Phandalin to seek out the elusive Cragmaw Castle and find the captive Gundren Rockseeker. Their journey takes them through dangerous territories, triggering potential side quests such as visiting the banshee Agatha's spectral grove, investigating the undead-infested ruins of Old Owl Well, and dealing with the orc encampment at Wyvern Tor.

The most perilous detour leads to the ruined settlement of Thundertree. Overgrown with toxic vegetation and creeping blights, the village holds dangerous cultists, a reclusive druid, and its most terrifying new resident: a young green dragon named Venomfang. Ultimately, the heroes must infiltrate Cragmaw Castle, a dilapidated fortress held by King Grol and his goblinoid forces, to rescue their dwarf patron and uncover the map leading to Wave Echo Cave.