Motherships are mighty protoss support vessels. At the heart of each mothership is a huge khaydarin crystal infused with an incredible amount of psionic energy. By tapping into this energy, a mothership can warp or crack the very fabric of space-time itself. The devastating power of a mothership can wipe out squadrons of enemy ships in the blink of an eye or lay waste to entire planets. Other aspects of a mothership's interior include a waking chamber for its commander, crew quarters and a med-bay. A number of escape pods are also featured.
A single crew member can pilot the ship for simple warps. More complex operations require a crew. Motherships are costly and time-consuming to produce. As a result, the protoss have begun constructing them in two stages, with the mothership core being the first step. The core itself can be used as a defensive and support weapon. [Source: wikia]