Spacing Guild
In "Sandworms of Dune" (2007), the sequel to "Hunters" and finale of the original "Dune" series, the Spacing Guild has begun replacing its Navigators with the more cost-effective Ixian navigation devices and cutting off the Navigators' supply of melange. More and more Navigators are dying from withdrawal of the spice — including Ardrae, "one of the oldest remaining Navigators" — and many defect and disappear into space rather than allow the devices on their ships. All are unaware that Face Dancer infiltrators are behind the plan, plotting their own takeover of the universe.