First Founders' homeworld Edit
The first Founders' homeworld was an M-class rogue planet located in the Omarion Nebula. The Changelings who would become the Founders of the Dominion withdrew to this planet thousands of years ago to escape persecution by the solids.
In 2371, Odo experienced a mental compulsion that led him and Major Kira Nerys to the planet after the USS Defiant was captured by the Jem'Hadar. The crew of the Defiant was also brought to the planet and subjected to an experiment by the Vorta to gauge their level of resistance to a Dominion invasion. (DS9: "The Search, Part I", "The Search, Part II")
Thirty percent of the planet's crust was destroyed by weapons fire from warships operated by the Cardassian Obsidian Order and the Romulan Tal Shiar later in 2371, during the Battle of the Omarion Nebula. The Founders had previously evacuated the planet, and deliberately enabled the attack so as to ambush the two intelligence agencies and render them incapable of resisting the planned conquest of their respective empires. (DS9: "The Die is Cast")
Second Founders' homeworld Edit
The new Founders' homeworld was located at secret coordinates deep in Dominion space. The Great Link appeared to cover much of the planet's surface, leaving very little landmass.
The Defiant was guided by the Jem'Hadar to this planet in 2372, when the Founders forced Odo to return to the Link to face judgment for killing another Changeling. (DS9: "Broken Link") Odo again returned to the planet in 2375, after the end of the Dominion War, to cure the morphogenic virus infecting the Link and convince them that the solids did not pose a threat to them. (DS9: "What You Leave Behind")