This expansion adds two new houses to Dune: The Ecaz and the Moritani It also adds in new game mechanics: Homeworlds allow you to conduct raids on the homeworlds of other factions and destroy their spice stockpiles. Nexus Cards provide players with incentives and special effects for not joining and alliace. Discovery Tokens add new elements to the game on sections of the board that are often bypassed and don't see much action. Discovery Tokens add new elements to the game on sections of the board that are often bypassed and don't see much action.