Since they need to regenerate frequently, and due to the energy required to hold a solid form, Changelings prefer to spend the majority of their time in a liquid state. When they communicate they rarely do so verbally, as they prefer to meld together into what is referred to as “linking,” which is a bit like mixing two cups of water together. When linked, Changelings cease to be individuals, merging into what is, in essence, one being. In effect, there are no true individuals among Changelings, only parts of the whole who gain brief periods of individuality when separated from the Link.
As such, the Changeling homeworld is essentially one giant ocean comprised of themselves in what is called the Great Link. During their lifespan they can become individuals to explore the galaxy and return home to the Great Link to share what they’ve learned. Described as “a merging of form and thought, the sharing of idea and sensation,” the Great Link is a place of comfort for Changelings. However, this Great Link, covering nearly the entire surface of a planet in the Omarion Nebula, also makes a tempting target.
In the two-part “Deep Space Nine” episode, “Improbable Cause” and “The Die is Cast,” the Romulan secret police known as the Tal Shiar teamed up with the Cardassian intelligence agency the Obsidian Order to destroy the Changeling homeworld. Unfortunately for the Alpha Quadrant, this all turned out to be a ruse by the Founders to eliminate both factions.
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