The Xindi reunification was the re-unification of the Xindi on a new homeworld. Plans for reunification began after the Xindi Civil War and the destruction of Xindus with the formation of the Xindi Council.
After learning of Earth's "threat" from the Sphere-Builders, the Xindi put aside their plans for reunification. (ENT: "Stratagem")
Dolim believed that unification of the Xindi could only occur through Reptilian rule. (ENT: "The Council")