Remove agenda 1a from the game, moving all of its doom to agenda 2a. Remove each location from the game. (Investigators are not defeated during this process. Other enemies and attachments at those locations are discarded, and concealed mini-cards are set aside.)

Put The Knotted Tower, Gravity-Defying Climb, and The Towering Vertex locations into play in a straight vertical line, with The Towering Vertex at the top and The Knotted Tower at the bottom. Take the top 3 locations in the Otherworld deck and place them in the shadows, arranged in a line from left to right. Take the 3 City of Remnants mini-cards and X decoys, where X is the amount of doom on agenda 2a, shuffle them facedown, and distribute them as evenly as possible around The Knotted Tower to its left, right, and below.

Place each investigator at The Knotted Tower and The Red-Gloved Man enemy at the Towering Vertex. Shuffle each other set-aside Coterie enemy into the encounter deck. (Note: From now on, draw cards from the encounter deck during each mythos phase, as normal.)