Perform the setup as indicated in the Night of the Zealot Campaign Guide, with the following exceptions:
- When gathering encounter sets, also gather the new encounter sets for Return to The Devourer Below shown here.
- When choosing 4 Arkham Woods locations to put into play at random, include the 4 new Arkham Woods locations included in this encounter set, for a total of 10 possibilities.
- After setting the Umôrdhoth enemy aside, flip this card over and attach it to Umôrdhoth.

Vault of Earthly Demise cannot leave play.
Umôrdhoth gets +X health per investigator and gets +X fight, where X is the number of resources on this card.
Forced - When Umôrdhoth enters play, place 1 resource on this card for each act remaining in the act deck.