This is a summation of episode 11 of the Landscape season 3.
The adventurers leave Arcimen and meet Gust, Linger and Nolan at Gust's lair on Johann's Bulge. The gold dragon and the ranger take the heros to Sigil, where they locate Mneneveth's lair and are reunited with Mac - now a wraith brought back by the grace of Death Himself to finish his revenge business.
The adventurers stumble their way through the trapped maze and finally locate the massive horde left behind by the dracolich. They tally everything up and set out on the town to purchase supplies for their war against Broxinullst.